No assumptions. I know plenty of people who knew Fred.
Regardless, you're making a statement that you know what's in his son's mind, which is impossible to prove.
So, even assuming that, we'd have to speculate if would he craft policy around these perceived assumptions, and the answer is no. Trump is not going to institute any practices that looks to remove all minorities, blacks etc from the population. So it's completely moot.
If you look at what he's done - $85 million per year to fund black colleges, lowest black unemployment, etc, it's easy to see why he's supported. Being the victim of a warped / compromised judicial system helps as well.