Why no Cannons on Police Helicopters?

In article ,
"Jim Doyle" wrote:

People will still burgle, if they're expecting armed resistance then it'll
just make them more desperate and quick to fire upon being approached.

Oddly enough, that doesn't seem to be the case. (The rate of burglary of
occupied homes in the U.S. is much lower than the equivalent rate in the
U.K., for example.)

10,000+ firearm deaths kinda speaks for itself.

No, mostly it speaks to a failed policy of Prohibition; most of the 10K
you cite are people engaged in one aspect or other of the illicit drug
trade.