Several points. The French Revolution and the Russian Revolution certainly did change things, so it's not necessarily true that shooting CEOs won't change things.

Next point. There might be a change in direction. Instead of shooters going to schools to find targets, they might now decide on CEOs and executive staff.

Next point. When people have accepted that it's okay to cancel people if they disapprove of their views, it's not much of a step further to think it okay if they are guilty of something. Those people who have grown up in an environment where they have been taught that their feelings should steer them, and nor principle, will not hesitate to act on their negative feelings.