When you create the ability to brick phones you create the ability to mass-brick phones. Imagine a totalitarian regime seeing an uprising on the horizon and bricking the phones of protesters that attended some protest. Imagine hackers or three -letter agencies getting this ability wanting to disrupt the economy of a town, city, or country. I wouldn't be opposed to someone having software on their phone to remote brick it. I'd be surprised if something like that didn't already exist. It's government mandating a backdoor that's the problem.

Because the authorities could then brick anyone's phone at any time. Including rich people and corporations that could hire security consultants to manage hackers to do it.

Because it’s the police’s responsibility to stop the snatchers in the first place? Not insist that other companies make up for their lack of results.

It’s not a COMPLETELY terrible idea, I know Apple already bricks stolen phones upon request, but at the owner’s expense. It’s still the people hired to solve the problem passing the responsibility on to others.

They will still steal them, just part them out.