Oh I believe it. That video you posted is a good example of how white supremacists gain favor from the general public. They're lead to believe that white people are more victimized than minorities. Take this specific portion of the video for example: "Even though there are far more whites who are killed by the police every year."
First of all, what that chart shows is not "far more" whites than the minorities. It's just about even, or slightly less. But even if you want to only compare it to another specific minority like "Black", the video creator deliberately leaves out two very obvious fallacies that he doesn't want you to think about.
1.) There are far more white people in USA than minorities:
and so with an overwhelming majority, there's little surprise that more white people than any other specific group are being killed. However, the main point is:
2.) The police shootings of minorities that have been sensationalized by the media have generally been about cases where the minorities were murdered by the police (like the police officer who was sentenced to 20 years in prison for shooting a black man in the back and then planting a tazer on him https://www.nytimes.com/2017/12/07/us/michael-slager-sentence-walter-scott.html ), or cases where that is the suspicion. The reason many of the white police killings aren't sensationalized is because they're not nearly as often executed while unarmed, with their hands on their head, etc.
These videos won't talk about these things. All they want is to scare people into buying into things like this other gem from the same video author:
I would like to tell everyone to please don't fall for this nonsense... Yes, in some cases us white people get the shaft, but we are still far far better off than any minority group. We will be just fine.
But that leads me into my main point here. No, I'm not surprised that Trump won because the average voter isn't very knowledgeable about who or what they vote for, are easily impressionable, especially when the motivation is fear and victimization, and they don't fact check. Many people who voted for Obama fall into this category as well. They vote for the wrong reasons. It's easier to win by being dishonest and using fear mongering.
Thats great in all, but you yourself are omitting that that same small black population is responsible for over 50% of homicide cases and is 8.55 times more likely to commit robbery than white people. Granted, thats just from a quick search on wikipedia, but it feels nonintellectual to say the data is not there. As a black person myself, I believe the real offense comes from if you believe that this is due to nature (by race) or due to socioeconomic conditions.