"Yes. BECAUSE of the police, which can be turned against the population"
Just, any authoritarian government today turns the *military* against the population, with tanks, helicopters, etc, all with far heavier weapons than an assault rifle. So, unless you get antitank and antiaircraft guns and missiles, you have no chance to resist it.
Enemy in Vietnam, Afghanistan, and Iraq had far more heavier weapons than AK-47s only. Ask those in M1A1s hit by Russian antitank missiles..
The four soldier killed in Niger couldn't defend them with their M4 carbines against terrorists armed with heavier machine guns (12.5 and 14.7 mm ones).
Anyway, the second amendment give the rights to bear arms, not any arms - I would like to see what would happen if someone should start to buy second hand tanks and cannons.
And exactly because today there is a national army, there is no any "well regulated militia". and thereby the whole amendment looks really anachronistic.