It all boils down to the facts of low intelligence and poor impulse control. As a group they require external controls.
I’ve seen where studies show that blacks reach pyhsical maturity sooner than white kids, in general. Which is how a 17yo Trayvon might easily overpower middle-aged George Zimmerman.
I’ve also read the conclusions of studies which support what you say re lower inpulse control.
Someone has offered the interestimg theory that blacks as a race (in the US anyway) are contributing to their own regression (not talking about regression to the mean in the IQ sense, though that plays a part in this) because, thanks to taxpayer support though welfare, the lowest common denominator is controlling the breeding pattern. Ie, the most “successful” thug types-the most violent and aggressive males-are reproducing with the most irresponsible females. As the achievement gap had yet to be closed as it was, this lowest common denominator being the most fruitful will not contribute to its closing. Quite the contrary.