Hint: never

When you say 'blacks do more street crimes', what you're actually saying is 'more crimes committed by blacks are reported, more blacks are arrested, more blacks are put on trial'. You're not proving that they 'do more crime', but that whites doing the same thing will often get a blind eye turned to them, so they simply don't make it into the crime statistics. If you don't patrol white neighbourhoods as frequently as black ones, of course you're going to find more 'black' crime. You find what you look for, not what you ignore.

More outdoor activity, fewer cars, higher population density, etc.

But, he thinks the crap he stepped in smells like roses. Can't change a person like that, the best you can hope for is to not see him on cable, which I don't.

From what we consider to be worth making a crime or not, to what is a misdemeanor vs felony, to what we consider to be a crime worth investigating, to what we consider to be a crime worth prosecution, to whom we assume is more likely to have committed a crime, to whom the police are more likely to investigate, to who is more likely to get drug-sniffing dogs or otherwise have their car searched at routine traffic stops, to who is more likely to actually get arrested, to who is more likely to be pressured to put in a plea deal, to who is more likely to be viewed as a "thug" by a jury and therefore convicted even if it goes to trial, to who is more likely to go to jail, to who is more likely to get a longer sentence . . .

And there's probably lots I missed.

Anyway, the criminal justice system is so inherently racist that any statistics about who commits more crime have to be looked at with a grain of salt.