As I see it just because we shift the focus to the lower level (the layer executing the swats) we don't have to automatically let anybody off the hook on the higher levels. We can have both.
> He’s not being harassed by the swatters.
The question is pragmatic: are you going to surveil and psychologically analyze everyone in the world in order to detect and pre-crime imprison everyone who might potentially call in a false tip anonymously, or are you going to control your police forces so they don't attack people with sometimes deadly force based solely on anonymous tips?
No one suggested this; strawman.
There are a whole lot of ways to harass someone using proxies beyond swatting and the traditional ordering of 40 pizzas to their house. Even if any given proxy only falls for it once it can be really bad.
Coming up with ways to counter these kinds of harassment campaigns is important, but it probably doesn't involve "pre-crime imprison[ment]".