Would you let a police officer search your home just because they say they wanted to? Would you let them search your phone just because they said they wanted to

Would you let a police officer search your home just because they say they wanted to? Would you let them search your phone just because they said they wanted to? I fully accept that there are some places and situation where these searches are approved but police should not do law enforcement based on the notion that "we want to be able to do this". If they want to force brick a device then a judge can approve a request or order that. Just hypothetically, let's say there is a protest against the police and let's also agree that police can act "as they want" with respect to mobile devices. What would stop the police from geo-fencing all phones at the protest and bricking them?