Kitchen knife use case #2: Make a sandwich. (this use case also seen just the other day)
Maybe you don't have the problem. But, for example, a city here in our state has been known to have a problem with "protesters" deciding that they're going to fix the problems with the culture in their local neighborhood by smashing the few remaining businesses in that neighborhood and burning the houses of the few little old ladies who haven't already decided they'd be safer living elsewhere as a homeless street person than in the middle of place like that.
The cops are too scared to even attempt to mitigate all of that violence and destruction unless they have function physical protection while trying to push a mob of looting arsonists away from the stores they're trying to destory. A tool that helps them to do that is a good thing. If somebody has a problem with the fact that a politician with the wrong idea about things might use such a tool to chase away people who aren't being violent and destructive, then they need to vote for different politicians. In the meantime, recognize the fact that there actually ARE violent, destructive herds of "protesters" who actually do get together to destroy and smash and steal things, and that it's absurd to tell a police officer to risk being, say, burned alive or having her head caved in to try to repel looters. A tool is a tool. There are always going to be outlandish or absurd use cases. If there is NO good use case (say... police batons with spikes on them?) then of course the tool is worth ridiculing. Giving cops a tool to protect themselves while preserving others' lives and property is a good thing. Misusing it is a bad thing, but that's true of cop cars and every other tool they've always had.