Doesn't sound excessive to me.
Sounds like he (dead guy) used his vehicle as a weapon.
People have a weird idea that only guns are deadly weapons.
On Saturday the 22nd at 1:47am, Portage Police Officer Grant Crizer made a traffic stop on a blue 2004 Jeep Liberty. The suspect vehicle pulled into the driveway of 5296 Royal Avenue. At some point the suspect put his vehicle into reverse and accelerated rapidly into the officer’s fully marked squad car, striking it. Witnesses initially reported hearing the officer yelling commands to the driver, and an engine revving, followed by 6-7 shots fired.