Those companies make things that you buy. If you didn't buy them, they wouldn't make them.
Ultimately all of this can be drawn back to the consumption of the individual.
This is rhetorical sleight of hand. If "you" don't by them, literally nothing changes, because you constitute some insignificant portion of the market. What you mean is If millions of people didn't buy them, they wouldn't make them., but the parent is one person, not millions of people, and therefore their comment is entirely correct.
Here's a handy rule of thumb--if some problem is so intractable or of such a grand scale that you could devote every waking moment of your life to solving it without making a discernable impact, then it is so utterly beyond your control that you should not feel compelled to make non-trivial personal sacrifices when you know damn well that they are utterly meaningless in the grand scheme of things. Vote, donate, and try to enjoy yourself. Or better yet, devote your time and emotional energy to a problem that's actually in your power to address in a meaningful way.
Make good choices to reduce your emissions footprint.
Don't breed.
Vote for parties that believe in and act on doing something about climate change.
I think it's more accurate to say they have _some_ fault AND no choice, because the world was already there, they existence wouldn't change anything and there's nothing one can do to change it (i mean, ordinary people like us).
We have marketing, media, teachers, society, manipulating us since we were kids.