There's a part of the story where demons are negotiating peace between a town and attacking demon forces. As soon as Frieren hears of this, she says the town is doomed.
Moral of the story is if your problems are caused by a group, don't expect a member of that same group to help you solve that problem.
Aside from the Arabic (Islamist) ones? The Portuguese did... most of them.
Almost every seafaring nation had them, I presume, but not in numbers like the Dutch, Belgians and Portuguese. (And Muslims, obviously.)