BTW, if you choose to study this subject, I think that one of Rabbi Berel Wein’s big books has an overview of it that will explain what you need to know.
However, if you are adventerous & decide to get more in depth, then it will become MUCH clearer as to why certain groups act certain ways to other groups….but be prepared, some of it is hard to swallow & it’s going to make you ask a BUNCH more questions. B”H, I had access to a rabbi & 2 secular professors that were very knowledgeable in this matter. But it still hurt.