That’s not what can be understood from a comment that simply condemn violence with one example though. I mostly agree with you otherwise.
But I am starting to change my mind recently with a simple parallel : strike is a kind of violence with a company, and it works very well. A strike in a single company can have positive effects for the people who work there. A global strike can have positive effects for everyone.
I am starting to think that physical violence may have the same property : of course an organised revolution is the best. But in the mean time, I don’t think assassinating a CEO is useless. I’m not saying it’s what we should do, at least not to this day. But I am wondering: did the last such event had positive or negative effects?
Ceos being scared for their life is a notable change IMO. Surveillance and repression are as usual.