Yes, there is a great deal of lore regarding the original Thanksgiving. There are many stories about the ‘First’ Thanksgiving involving “The Pilgrims”, which results in questions about what really happened.
At the end of the day, does it really matter? One can look at history through a 21st Century lens and judge those who came before us. But, it is folly to do so. Unless you have lived in the skin and souls of those who came before, it is impossible to judge. Modern people fail to look at the context, political environment, world order, beliefs, opportunities, oppression, fear, bravery and philosophies of people who came before us.
There have always been conquests and conquered. There have always been oppressed and oppressors; there have always been people exploring and looking for a better way of life. Study history and appreciate there are nuances. The original settlers in what became America were looking for freedom of religion. Many died of starvation and disease. Do you really think they risk everything to be deemed oppressers hundreds of years later? No! They wanted to escape oppression and execution by intolerant monarchies.
Nuance. Context. Time & place considerations. Judge not lest ye be judged.