During slavery, there were lot of people protesting. Regardless of their protests, slavery of Africans lasted over 300 years.
During colonisation, there were lot of people protesting it. Regardless of their protests, African direct colonisation lasted 200 years, and still is going.
Why did those protests fail?
Powerless people making moral noises and calling to ethical values had never stopped people in power to do what they have to do in their interests.
Power respects only power.
Get a life, and stop itching people ears with your powerless declaration. Pity seeking, victim porn, and fist in the air are for noise makers.
Seek power by all means possible then you’d be listened to, preferably feared in the first place.