<Obama drove up hatred amongst his base>
Surely you meant to say "Trump" -- it's Trump who is promoting and defending neo-Nazis, white nationalists and white supremacists. The rest of your post consists of distortions and lies about Obama and about Black Lives Matter.  I'll cite one: When five Dallas PD officers were killed, BLM condemned the killings and so did President Obama who described the killings as "vicious, calculated and despicable."
http://www.cnn.com/2016/07/08/politics/obama-dallas-police-shootings/   and
https://www.washingtonpost.com/posteverything/wp/2016/07/21/how-president-obama-failed-black-lives-matter/?utm_term=.7e1f12b449bf
There is lots of truthful and accurate information available. The Wikipedia article about the Dallas killings is a well-sourced, good place to start for readers who want to dissect the disinformation in your post.