1. Ben Carson had an excellent chance, but he wasn’t very well informed on the details of public affairs. Unlike Trump, he would have been acceptable to the bulk of the “rank and file” Republicans, including the Tea Party and the Neo-cons, and would have been tolerable to the Country Club. He would have had trouble with the “deplorables” (working class whites), but he probably would be leading Hilary at this point.
2. As we know (consider the Rubashkin case), there is a problem of the criminal justice system being “out of control.” The Democrats find this to be a problem only when their own supporters get shot and want a limited response focusing on “Blacks lives matter” while ignoring the rest of the problem. The alternative is to focus on the overall problem of police and prosecutors acting as if they are ruling over the population, rather than being charged to “protect and serve”. In all fair neither party really wants to disrupt the entire system, though the Libertarians come the closest.