I agree that it’s human nature and always will be. But that doesn’t mean it’s ok or that we should shrug and say oh well.

Agreed.

It means that we need to always be guarding against it and condemning it when it happens.

Agreed, in principle, but i suspect our definitions of what qualifies as "it" will differ greatly.

There are times in history where ideological violence has gotten way out of hand, and i believe we can avoid that if we try.

I think that's naively optimistic, though having it as a goal isn't the worst thing we could be doing.

Also there are times in history where blind optimism has let toxic and harmful ideologies fester and take root.

Think "Paradox of tolerance".

And if we instead encourage it then we will have another cultural revolution or holocaust like in China or Russia or Germany.

That's a hard, giant leap in logic, you'd need to at least have some evidence of direct causation before I'd even consider that as a reasonable line of thought.

But that is only my opinion, with all that entails.