You are moving the goalpost and just make up stuff. Plenty of time to ... do anything, yet nothing has really been done there. If they are so great they should have been able to defend themselves. If you want to keep the discussion real and objective, feelings aside.
I am also not trying to excuse past behaviors or anything of the sorts. It was what it was and we always strive to do better when we know better. But that being said, systems are built around what is functional considering everything that can happen. When you account for everything to insure your safety and survival, it seems to work out like it did. On all sides.
And again, these interactions are never one way, longer term there's benefits to both sides, the local country, and descendants of all slaves and slave owners.
And just as an aside, I could very well argue most of us are still slaves today, but with clearly way better conditions and freedom of movement. But if you don't toil away daily, 5 days a week, you risk medical issues or lack of shelter, kind of like the homeless discussion in this thread. In some cases even death.
So putting what a few rich people from hundreds of years ago did, on me, a regular European folk, is shortsighted or even evil. I had nothing to do with any of it, my ancestors were peasants. And the same is valid for most people OP is referring to when saying "europeans". It's pure nonsense.