I think you’re unable to have more than a surface level conversation about this.
The issue isn’t that the police stopped a terrorist. The issue is that they used excessive force once he was stopped.
If we live in a country where police are being encouraged to use potentially lethal levels of force (kicking someone in the head can quite easily kill them), and it’s normalised and celebrated, we will have a society where that level of force is normalised within the police force. If you get called evil, an anti semite, a “terrorist sympathiser” for pointing out that perhaps some of their actions were not the best, it plays into the hands of those officers who do want to use their position and abuse it.
We have seen multiple times that there are plenty of bad eggs in the police force (and I am not saying that these officers are “bad eggs”, before someone says that I am). If we normalise this, where does it end? A police officer pulling you out of your car and kicking you in the head because they can’t see your hands at a traffic stop? Police officers using their positions to abuse women, as has happened before?
This is a debate with layers to it but some people seem entirely unable to have that conversation.