Maybe that opinion is unpopular because it puts more expectations on the victims of unjustified violence than the theoretically-trained perpetrators.
We should of course be trying to reduce police killing, especially police killing of unarmed people, and seriously looking at the factor of two difference between the rates for blacks and non-blacks (factor of three for unarmed killings) to see if it is due to racism by police and fix that if it is.
But we probably also should not overstate the risk. Getting killed by police in the US is way down on the list of things that are likely to get you killed, even if you not white. An unarmed random person is about as likely to be killed by lighting as killed by police. An unarmed black person is 3 times as likely to be killed by police as killed by lighting, and 3 times as likely to be injured by lighting as killed by police.
Here are the numbers.
There are typically around 1000 police killings in the US per year, and about 200 of those are black people. The black population is around 37 million, out of a total of around 330 million. That gives a black killed by police rate of 0.54 per 100k, and a general population rate of 0.30 per 100k.
About 10% of the black people killed were unarmed, and about 5% for the killed population in general, bringing the unarmed killed rate to about 0.05 per 100k for blacks and 0.015 per 100k for the general population.
About 500 people are injured by lighting every year in the US, giving a lighting injury rate of 0.15 per 100k, and about 10% of those are killed, giving a killed by lighting rate of about 0.015 per 100k.
Many people are not aware of these things off the top of their heads, but most black people--who are statistically six times more likely per capita to be killed by cops--definitely are aware.
Even if the law is nominally on the defendant's side, there is a good chance that she will be threatened with charges carrying significant penalties, possibly backed up by nothing more than the testimony of the officer who violated her rights in the first place, and offered a plea deal. Accepting the plea deal forecloses on any chance of righting a wrong.