We can't afford it.
The people were armed before the first city police was established.
The legislatures had to vote to create the first police force after the police people asked PERMISSION to become a police force., -
The police cannot be more fully armed than the people from whom they receive permission to exist.
cf formation of the NY City Police force by the NY State legislature.
I read the Constitution once, and I didn’t happen to notice such power granted to the President.
bfl