Only a small fraction of the Indians survived, for them to be assimilated to the other cultures. For example, the tribe which Columbus first encountered in the Americas (Taino nation, within the Arawak super-group) numbered 3 million in 1492 (according to some sources, they numbered up to 8 million). Within the next 5 decades, this population went down to just 500 individuals. 80% of the mortalities were caused by disease and starvation, while 20% were caused by warfare with the Spaniards. The survivors were assimilated by the Spanish and the African slaves.
Yes. It is a crime. Introducing previously unknown mortal diseases to peaceful populations is nothing short of outright genocide. And the Catholic priests refused to give medicines to the dying natives, asking them to do the prayers instead.
MEDICINES? In an age when viruses and bacteria were not even known? Don't make me laugh.
Meanwhile, since you affirm these actions or lack of are "crimes," I repeat my assertion.
If all these things are crimes, then we need to immediately stop all the disruptive technologies we are now working on - GMO crops, computers, AI, gene splicing, cloning, space exploration, anything else that might cause the Enlightened People of hundreds of years hence to think of us as criminals.
The only way you can be logically be consistent is to immediately stop using your computer. I assume then that the proof of your conviction is that we won't see any more posts?