No, No and No.
I will do everything to help a SL, Spec or even a random Bravo PFC that's getting arrested before brief or after evac unless he made a major fuck up on purpose.
If you're trying to arrest a guy for a minior thing like having a gun out in briefing, brawling a fellow marine in bunks or crossing the CP you should get fucked over by marines because you deserve it.
And regarding brig breaks - they WERE possible and I broke free multiple times WITHOUT any outside help just with my boots and a lightbulb. Outrobusting the MP with a fire extinguisher from the locker or a crowbar from the rack and then using their handcuffed body with a stripped headset to open the door was the hardest part, but it wasn't impossible (Hello MP mains that never play PFC or any other marine roles)