1) Marines are trained a little bit in reasonable force, however, in a situation where a deadly weapon is involved, I'm pretty sure most would just throw that right out the window (I would, at least until I was positive that the weapon wasn't a threat any more... you never know, the guy might be flying high as a kite on crack).
2) What do you mean? Why don't policemen learn combined martial arts, marine corps flavor designation: Marine Corps Martial Arts Program (MCMAP)? I dunno, why don't they learn kung fu? They aren't a SWAT team, they are law enforcement officers. Why don't they learn to shoot a man-sized target in the chest using iron sights at 500 yards like we do?? (ok, they have switched to a 2X ACOG RCO since I went to boot)
EDIT: While I'm at it, why don't they also learn Table 2? Shooting moving targets; rapid reload, dropping multiple targets, etc?
I'm sure they do learn some of these things, but they aren't trained primarily in the mission of the Marine Corps Rifle Squad:
To locate, close with, and destroy the enemy by fire and maneuver
-OR-
To repel the enemy assault by fire and close combat