“Fuck you nvidia!” doesn’t sound that genuine when you just said you’re going to invest in their company, thus boosting its value even further.

Sure, but I guess that then changes the question to “is it evil to kill people?”, which I’d say depends on the context.

Also, guns can be used to defend against an invading enemy. I wouldn’t consider self-defence to be evil. Being the invading enemy, that’s evil.

It’s actually the other way around, cacti (or cactuses) is the plural of cactus.