Absolutely wrong. Police are the exact opposite of reactive today.

Police now use a system of profiling. They have an idea of who they want to arrest before they even hit the streets. They'll pass up several suspicious people and situations en route to pursuing people who fit their criminal profile, which is typically gang members and drug dealers, young men of color.

The prison industrial complex plays into this, as well. If police targeted the proliferation of guns, if we funded and resourced the ATF the way we do the DEA, gun violence would decrease. But they'd rather throw a hundred poor people in jail than try to convict just a handful who have money for lawyers.