Because you're deaf.
Belgians were white too, obviously. Here's what they did in Congo:
One junior white officer described a raid to punish a village that had protested. The white officer in command ‘ordered us to cut off the heads of the men and hang them on the village palisades … and to hang the women and the children on the palisade in the form of a cross.’ After seeing a Congolese person killed for the first time, a Danish missionary wrote: ‘The soldier said “Don’t take this to heart so much. They kill us if we don’t bring the rubber. The Commissioner has promised us if we have plenty of hands he will shorten our service.”‘
https://ghb67.wordpress.com/2012/03/05/african-holocaust-king-leopolds-belgian-congo/
Just Google "Belgian Congo" and you'll get all sorts of graphic images of people's feet and hands cut off by Europeans and the torture they were subjected too.
Show how much you know about history if you think only Anglos owned slaves. Portuguese and Spaniards wiped-out 99% of the Native civilizations (Mayans etc) in modern-day Central and Latin America by raping the women and enslaving the men. How do you think the modern-day "hispanics" came into being?
How do think Christianity and the Portuguese and Spanish languages were spread to South America? Through peace? No, through rape, genocide, and conquest.
Of course your reply is just going to be more of the same bbbbut other people did it too!!!! Without any proof whatsoever that other races did this amount of genocide, rape, and pillage at this scale. Don't worry - looking at what's going on in Europe these days the days of Western Civilization are numbered anyway. Then we'll get to say the same -- "bbbbut you did it too!!!" when the brown conquest of Europe is complete.