Besides what @DROT said, which is accurate, one of the problem the cop side must get over in order to stand against a couple of criminals attending a BR, SR or JB, is actually team working. If you look closely, most of the criminals are always working as a team, one distract a cop while the other tries to kill the cop, when his team mate got tased, the criminal will try to save him, etc etc. While most of the times in the cop side, cops just rush one per one in the store robbery, jailbreak or bank rob. While you got good tools such as spray can, flash bangs and taser, most of the times you take no advantage as it should from those things. If any gang had access to those kind of things, we would be unstoppable. Take as example, SWAT. Back when ALT switched to group, you saw a lot of SWATs raiding a Bank rob, a store robbery and jail breaks, and only with 5 or 6 swats (sometimes even 3) were enough to stop a store robbery, a jail break or a bank robbery. It is just a matter of team working and learning how to do it.