Okay for the unbeliever about BLM/Antifa being a racist cult:
https://www.newsbreak.com/news/0PEMrEUB/its-a-cult-thousands-of-whites-grovel-in-front-of-blacks-begging-for-forgiveness-video
https://www.newsbreak.com/news/0PEFpYoy/black-lives-matter-if-youre-white-pass-the-mic
https://thewitnessbcc.com/pass-mic-white-ally/
BLM and Antifa are working together:
https://www.vice.com/en_us/article/7xqjv9/neo-nazis-are-giving-black-lives-matter-and-antifa-a-reason-to-work-together
BLM telling white people to leave a University diversity center:
https://www.bbc.com/news/world-us-canada-51506733
As to your other points:
- BLM was started in response to the killing of Trayvon Martin, not sure why you are implying he had been lynched but the killing was adjudicated in court and found legitimate and acted in self-defense. Trayvon Martin was yet another criminal. Rosa Parks wasn't. Dr. Martin Luther King had more than one opportunity to build his case but at least he waited for someone that was morally impeccable to build his case around.
- KKK is considered a hate group and a terrorist organization. Unless the Ku Klux Act of 1871 was recently repealed.
- Per Wikipedia: That night was a particularly violent in St. Louis, with 4 police officers shot and 55 businesses burglarized or damaged amid the Black Lives Matter and George Floyd protests.
Unless you are going to make a no true scotsmen argument, BLM/Antifa was responsible for organizing the protests and the protestors, they are responsible for inciting violence during these protests, they are the ones that delivered bricks and t-shirts and banners. If you say showing up like this: https://d.newsweek.com/en/full/1082058/antifa-portland.jpg is planning a peaceful protest, then you're delusional.