I think you are grossly neglecting the danger that these dirt bike and ATV gangs pose.

Right but there is a difference between people riding irresponsibly but without intentionally trying to destroy people, versus this cop who is very deliberately trying to take out as many bikers as possible. And especially for young people whose brains are still developing, in particular the parts of the brain responding for judging risks.

Like of course some of them are riding dangerously, and the dangerous driving should be socially discouraged...but the cops are a particularly blunt, carceral, and ineffective instrument for discouraging any reckless behavior, in particular the bastard in this video. And even within existing carceral systems, spike strips are blunt tools. For example, pigs could have filmed them and picked them up when it was safe to do so, or used the 69 bajillion security cameras that has to figure out who was driving and yell at them.