Yes, everyone slips up and has the "wrong" opinion once in a while.
Try reading a bit more carefully. Or at all, really. Has nothing to do with opinion, which is why I was going out of my friggin' way to avoid framing it like that, just how it's being presented. People do, in fact, occasionally use arguments that are dead on for or very much strongly resembling the ones used by proponents for stuff they're in opposition with. That there's issues with using the same argument used as support by people you're at odds with
should be blatantly bloody obvious. It isn't, apparently, but it's not like that was some kind of shun-the-other bullshit.
Looking back over it, there was a reaction to you using terms as a strawmanned conservative might "as long as it can be made to sound vaguely liberal/left" which is why I'm so frustrated with being "on the same side" as these people.
Problem isn't with some kind of strawman conservative, it's with the actual bloody ones and the actual sodding rhetoric and argumentation methods they use. The reason it's a concern is because when you're spreading the same message
you're spreading the same goddamn message, regardless of what you're trying to support with it. And maybe you take a second to make sure you're making the point you're intending to make instead of setting things up to make folks arguing against you have an easier time, by feeding into their talking points, their perspective on the issue, and on, and on, and on. There's meeting half way and understanding and all that shit and then there's functionally bending over for folks that are trying to fuck you and most of what you stand for, and it's damn easy to fall into doing the latter if you're not paying a particular sort of attention.
Again, this is something that was freakishly obvious in effect just a year ago, and has been SOP to attempt to inculcate for the more assholish folks involved in american political discourse for years before that. This isn't some kind of straw man from the aether bullshit, it's friggin' talk radio and might-as-well-be-bulletpoint rhetoric and junk along those lines.