If you can’t trust your police with it, then there is something fundamentally wrong with your society.
This announcement coincides with protests against police brutality, at which many police have behaved brutally. That was sparked by an outright homicide by a police officer, captured on video, of a man who was subdued and presented no threat -- while other police officers watched, and many others have subsequently attempted to justify.
The "something fundamentally wrong" is very complex and subject to genuine debate, but it's not subject to debate that whatever it is, people don't trust the police.
There's a gif that humorously demonstrates this mentality [1] and shows a police officer instinctively pepper spraying the air around him in response to falling down, even though there's no one around him.
Personally, I blame the laws & culture that encourage excessive civilian gun ownership. The common excuse for preemptive police brutality is the fear that a civilian could be reaching for a gun which puts the officer's life in danger. Without guns, police have no excuse to strike preemptively and it'd be much easier to gain political support for de-arming the police.