I think for the same reason you see high-speed chasedowns in the US, and you don't really see that in Europe. The risks involved in catching that perp are significantly higher than simply arresting them later. (Both risk economically, as well as risk to human lives).

I think they should focus on demilitarising the police in the US, with that you also reduce the funding of the police. As a lot of the money goes into buying military-grade equipment. I really don't know why the police needs a tank (see: https://en.wikipedia.org/wiki/Militarization_of_police)