As for letting bad things happen, every time the party we don't like wins the election, we let what we personally view as "bad things" happen instead of use violence to overturn the election. That's the whole point of democracy. We show some humility and respect the majority will. We respect the process.
As for letting bad things happen, there is something to do when your side loses the election: wait 4 years. It's a very easy action to take, you know for certain there will be a change or strong opportunity for it soon. That is not true in all situations.
And what is your evidence that he was personally involved in any of these alleged crimes? He's the CEO of a huge bureaucratic entity. He plays his own highly limited, even if high-profile role. He probably doesn't even know what's going on in 99% of the company.
Before going as far as taking his life, you should be able to articulate exactly what he did wrong, how he is culpable, etc, and back your claims with objectively compelling evidence At least try to mimic the judicial process before taking such drastic measures. That even this bare minimum isn't being done by the mobs of people cheering on his cold-blooded murder shows a basic lack of regard for justice and human life.
And no, it doesn't work that way at all. I have problems in my life, stemming from government laws, that I might have to wait 80 years for any government to fix. It's likely everybody does. If everyone resorts to terroristic violence because of such problems, the very foundations of society would fall apart and we'd see mass suffering far greater than anything people experience now.
The axioms for a majority of people right now are 1. Person X is doing bad things or leading an organization that does bad things 2. The government is refusing to address it and is actively abetting it 3. There is no way to stop this evil from occurring besides extrajudicial murder. The only thing you can suggest without breaking one of those axioms is that we must let evil happen because the alternative is worse, and frankly i'm not sure that argument is a good universal standard.