No, it's pretty fucking important to get caught up in taxonomy and political labelling when people are pretending to be one thing when actually supporting the exact opposite. You cannot be left-wing and support hamas. Hamas murders leftists. Hamas has always been at war with leftist ideology. If you shout "I am hamas" then you are at best an incredibly foolish useful idiot, and in any case completely blind to what hamas is, what they want, and what they stand for.
It's as easy for a left-winger to support Hamas who kills left-wingers as it is for someone LGBT to support a religion that says kill all LGBT
Which is why I say it's not "pretending" because they are left wing and they can support hamas and be left wing because left wing is not an objective state of being, it's just a political identity
Like a Chinese communist who supports Hamas and opposes collective punishment of Palestinians because of a small number of terrorists but also supports collective punishment of Xinjiangers over a small number of terrorists
You can go on about how "they're not real communists" much like a Christian who is vengeful and spiteful is being most un-Christian and yet, there are a large number of people who are walking self-contradictions. So you can just waste all your time saying everyone isn't really xyz like Margaret Thatcher isn't really a free market lady because she actually supported massive industrial subsidies, US police officers aren't real police officers because they don't actually protect or serve people e.t.c. but you just end up in a meaningless hole
You can point to every communist regime that wasn't very communist, every Islamic or Christian terror group or army that violates their own religious tenets, every political party that fails to maintain "ideological purity" and eventually you end up semantically deconstructing everyone into no true scotsmen
Cos at the end of the day I don't give two fucks if someone who wants to be a team killing fucktard is left wing or right wing, and the left/right wing meme isn't even that useful cos left wing USA would be far right europe but the left wing USA is friendly and self-identifies with left wing Europe. Is it doctrinely consistent? Who cares. It's just a label, useful only so far as it's useful
Hamas is not PLO, which was a union of many groups, with the majority of them being leftist and, iirc, secular. Being left wing does not require you to be non-violent or non-terrorist. There are violent leftists and there are terrorist leftists. We saw a lot of leftist terrorism in Europe during the 20th century: IRA, ETA, those German groups I can't remember the name of. Hamas' violence is not what makes them right wing. It's their reactionary, theocratic, and fascist ideology that makes them right wing. And if you support these things, you are not left wing.
Head to any Western University and you'd probably be able to find someone who supports Hamas without supporting Hamas ideology, same way you used to be able to find anyone who supported the IRA but weren't even catholic
Consider the triangle of Russia, China and Iran. The three are like three prongs on a chair and have basically next to nothing in common when it comes to governance, culture, faith or faithlessness. They still support each other without all mutually endorsing Chinese atheist communism, Russian orthodox conservatism or Shiite theocracy
No, a Catholic who doesn't know fine details of their doctrine ( or even disagrees with minor elements of their doctrine) is still a Catholic not because of his self-identification but because the majority of their views are consistent with the Catholic doctrine.
While the line of who is Catholic and who is not is vague, we can be quite certain that a person who claims that Jesus never existed is not a Catholic even if they self-identify as such. Supporting Islamic theocracy is just as incompatible with the idea of "the left" even if the line of who is "the left" can be very vague.
Where do you cut off the line? Does a Catholic who supports abortion and gay marriage stop being a Catholic when the Catholic church opposes it, and do they become Catholic again when the Catholic church changes its doctrine? When Tolkein insisted on Latin mass whilst the Catholic church adopted common liturgy, was Tolkein being un-Catholic because he was deliberately disobeying Catholic doctrine, or was he extra-Catholic for sticking to ancient Catholic doctrine? Who decides what is the majority elements of a doctrine, who decides how much of a doctrine is a majority? Are doctrines given equal weight, or are some more than others? When you have two left wing groups, and both are calling each other reactionaries, which one am I supposed to believe is the fascist, which one can claim doctrinal superiority?
Obvious answer: bro who gives a fuck. It's just a self-label. Don't have to start purity testing furries on how much furry lore and doctrine they know, whether they own a fursuit or not. Left wing is the broadest big nut label in the world, rivalled only by right wing. Fighting to see who is authentic true left wing and who is just a poser is silly billy behaviour