Horowitz is obviously bothered by the death of Trayvon Martin when a situation that could have been avoided escalated. The tragedy here is that young people are volatile and are prone to sudden acts which they often regret. Martin was no angel and Zimmerman took his neighborhood watch role a bit too far. However it is the jury’s responsibility to to convict beyond a reasonable doubt. Highly unlikely they will be able to convict. If however the verdict is followed by urban violence and innocent deaths, place the blame squarely at the feet of the irresponsible media and the politically correct prosecutors and politicians who brought this case forward.
The formational event of David Horowitz's political identity was the "civil rights movement".
He goes on and on about it, he is very defensive if challenged, and he will not permit any views contrary to his idealization of it.