Beyond that: for many people, youth or juvenile crime is considered a failure by society, and lamented. Kids were neglected, went wrong, and we lost them to crime. When the issue is black youth crime however, their identity is pathologized and the perpetrators are subject to dehumanization through terms. "superpredator": these black youths aren't like Johnny shoplifting a comic book from Walgreens, they are inhuman killing machines that prey on the rest of us. "bring them to heel" this is something you make a dog do. An out of control mad dog, who needs to be corrected through force.
I don't think Clinton _meant_ it to be racist. Believe it or not I don't think Trump did either. But I'd say both of them said racist things in the sense that they both fell into patterns that denigrate and otherize minorities.
The stats said that 1 in 4 women who cross the border illegally were raped. Trump was talking about the rapists, not all Mexican. He said some Mexicans are good. Some are criminals. And some are rapists. There is nothing racist about this.
To be fair. I agree she could and should have used better phrasing. I can also understand people like Sanders for criticise her. Maybe she even was bigoted 20 years age when she said that, or maybe she still is. But you have to interpret her words extremely uncharitably to infer that.
Here we are trying to figure out if here comments about gangs could be problematic while comparing her to Trump, who said this about mexican immigrants, not just mexican gangs: "They’re bringing crime. They’re rapists. And some, I assume, are good people!".