Trump just garnered more black support for his Presidential bid. However, it did appear to me that the use of force was very questionable indeed. Trump framed it the right way as well, he did not say the cop was at fault, just his impression based upon what he saw. I too will allow any and all evidence to be examined before forming any definitive judgment in the case.
He didn’t convict the cop, he described what he saw and left it open for revision if more facts came out. I can understand wanting him to withhold judgment, but I think he made it clear he was describing what he saw on the video. And it sounded pretty accurate from my vantage point.