It's definitely not racist to blame blacks for all crimes....
Racial profiling, to a degree, is not racist. It's making calculated decisions based on the actions of groups of people. Being a little more cautious around groups of people due to the FACT that more people of that group are more violent than other groups is just a safety concern, and not racism. Also, "blaming blacks for all crimes" isn't "racial profiling," it's just being flat out racist.
If it's a fact that the majority of crimes are committed by blacks, then cops should keep a close eye just in case. If you are a law-abiding black who is offended by this, stand up against what fellow members of your race are doing. I'm not totally for racial profiling, but I can see how it is justified.
Profiling in general is a useful tactic. Hell, I just used another generalization just now ... and everyone on the 'Yes' side is about to use one too. See how that works?
If there was just a robbery where black youths commit 90% of crime(this would be a fact) in the area and you as a cop saw a group of black teens on one side of the road and two white college students on the over who are you going to question? That's why I love when liberals try and explain how racist facts aren't facts even if there is overwhelming proof.