It didn't try to be realistic. The whole point is that the police response is always massively disproportionate to the crime.
It's a pastiche of society, everything is exaggerated: they have a legalize medicinal cocaine campaign, you can buy supercars online, rocket launchers and machine guns at your local gun shop, you can launch your car at 100 miles an hour of the edge of the highway and survive.
They even reference the outrageousness of it in a scene where Michael goes to the therapist and comments that he may have even killed someone on the way there.