Your post is ironically just a pro-terrorism argument. You want terrorism targeted at CEOs to change their behavior.
There are a million different viewpoints on what acts are harmful and how to minimize or prevent those harms. It's better that we use things like voting and laws and courts to collectively reach consensus on when to use violence, rather than individuals killing people who disagree with them.
You can argue that this CEO should have been arrested for some crime and you can argue that said crime should carry the death penalty upon conviction. But that doesn't mean it's valid for a random person to be judge, jury and executioner based on their own personal concept of justice.