AITA for having security at my mother's funeral, having certain people barred entry?

My parents divorced ten years ago, my father initiated it. He was seeing someone else and wanted to see if the grass was greener on the other side. I neither am for or against his reasoning but I was against how he treated my mother after they finalized their separation. One key event that stands out is in deliberating how assets (or rather, debt) was divided, my father promised my mother that he'd still around, still be in her life, even be friends, and see if they could rekindle their marriage, but only if my mother took every penny of debt. My mother was naive to agree to it, because once the divorce was finalized, my father was on a plane in a matter of days, off to live his new life. It should be obvious that none of us were happy with my father, and I've been no contact the entire time.My mother passed three weeks ago. She is survived by my two siblings and I. I was in charge of the funeral. I knew some of my cousins on my mother's side blamed my mother for their divorce and actively stayed in touch with my father. Imagine that, my mother's family took my father's side in all of this. I also knew there would be a nonzero chance my father would show up, and if he did, it would not be to pay his respects. So I hired security for the funeral and church service.Long story short, my father and his new wife showed up. They were barred entry. One of my aunts got very upset and caused a scene and let slip her daughter, my cousin, invited him. So I had security escort my cousin out of the funeral, too. This event has caused a rift between families, or at least embiggened the one already there. A few of my aunts and a lot of my cousin think I went overboard, some even removing me from Facebook.Was I the asshole in this situation? For what it's worth, I was not super close to those who were ejected from the funeral, nor the ones who caused a fuss. I can live a happy life having zero contact with them again, so I've lost nothing. I'm still no contact with my father (who flew out for the funeral).edit: I appreciate the awards but this is a throwaway account. Why award a throwaway with anything?There's nothing I'm really hiding here. I was the one who knew about the affair because my father left his e-mail open at home when he went off to work, and me being an immature teen decided to snoop. In them, his mistress-now-wife tried to convince him of fantasy things my mother did and tried to turn him against her. Things like she would ask my dad something my mother did to him that was maybe insignificant at the time and twisted it around so it became a bigger deal.Like one instance is when I was much younger, my mother went to bingo without telling him. My dad was the sole income maker at the time. My mom won a fair bit of money but my dad was upset she never told him she went beforehand (with his money). Something that was resolved 10 years prior and which was insignificant in the grand scheme of things, she blew it up to bigger than it was. Many such cases like this she blew things up to convince him to leave my mom.This is why I don't fault my dad for the divorce or separation: I fully blame the other woman. It sucked being 17 at the time but that's life, people get divorced, and it's not my place to get in the middle of my parents' relationship. However, I was upset with his behavior after the fact and the one event I mentioned.Much of my mom's extended family are more traditional and view divorce as a tragedy no matter the circumstances. They blame my mom for not "trying harder" to keep the marriage together. Once the divorce was finalized, my mother became an outcast to most of her family. This is why a lot of them favored my dad because he convinced my mom that she was why their marriage fell apart. He was a textbook manipulator. via /r/AmItheAsshole https://ift.tt/2FmPPkg