I'd be surprised if the assassination was cause he accidentally blurted out something like "Maybe we shouldn't be such vile pieces of shit and actually use our money and power to help the world..." and a fellow CEO heard and worried there might be a humanitarian in their midst, and that he just HAD to go.
(I assume you meant you wouldn't be surprised).
Lolno, dude was the head of the company for multiple years. If he wasn't a profit greedy POS and was trying to make the company less evil that would have been visible by now.
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Not everything is caused by conspiracies of rich people, poor and middle class people do their share of stuff as well.
A good rule of thumb is to look at it and say "Who benefits from this" if rich people or some company benefits in some way, they yeah, decent odds they are behind it.
Killing off CEOs/the rich very much does not benefits the ultra wealthy, and is in fact something they try hard to avoid.
After all, you don't want the poors to be getting ideas.
The odds of this being somebody upset over a coverage denial are slim. This guy used a suppressor, which is something that's just hard enough to get in the US that it is an unlikely tool for a crime of passion. He also methodically cleared the jams (likely caused by low-velocity ammunition - this makes the suppressor more effective but often won't cycle the action) without hesitation, which is not easy to do do so well even for somebody familiar with firearms. Not to mention that he seems to have fired three times (also dumping out three live rounds due to the mentioned jam-clearing) and hit with two of them. That's harder than you might think.
An angry person who wanted revenge for coverage denial would be much more likely to pull out a plain-Jane Glock or AR and dump bullets in the guy's general direction, not this extremely methodical and professional behavior.
I mean, the dude clearly had some degree of knowledge and firearm training, but this is America, we literally have more guns then people.
It doesn't need to be a paid assassin or anything, just a dude with some degree of knowledge (eg. see basically half the country) with a grudge against the company (eg. basically anyone who's actually gotten sick on their healthcare plan).
If it was an actual trained assassin he wouldn't have gunned the CEO down very visibly on a public street, that's hella stupid, and no actual assassin would do things that way.