When push comes to shove, pitch a fit

Why is it that a fact like this:

Stoned, beaten and insulted, their vehicles torched by crowds of hostile youths, French police say they face an urban guerrilla war when they enter the run-down neighborhoods that ring the major cities.

Always seems to lead to this:

Some residents complain the move spawned constant police harassment which has only exacerbated tensions with local youths, many of whom come from ethnic minorities.

Meuh. The Fuse is Lit (No Pasaran!)