well - blaming someone usually becomes blaming the player and not the roleplayed char. - but a reason to play police instead of military is to have an easier life. - as a police, i can back off a threat that is too great for me to deal with. - the military however... as the strongest powers available for the lawfuls must not back off... but sometimes fight even a loosing battle.
so, lets say - there is a gunship violating the law, the police is intercepting it in a typical light fighter; the police would have a good reason to "let go" and turn a blind eye on him - or passivly requesting backups by hte military.
the military however should not do that. - for one, they have no one but themselves to call for backup... for another, if its not them to stop them... who is left?
so, when picking the military, you also pick the greater responsibility. - when picking police, you take the easier job. - you can always say "its too hard, i cannot do it". - of course, a lone military tagged fighter cannot take a gunboat either... but in RP, it still is the last power that can stop it.
the police has a reason to be there - a problem is that authority is not supported by any tool. - the military executes martial law, somewhat. - when they are involved, it usually means "death sentence" ... the police should not kill, but rather derail hostilities. - now, the game engine does not provide any thing to do so. - there is no way to imprison a pilot, or disable its weapons and ship. - so the police must destroy, too ... and for that, it lacks the tools. - but thats not a problem of the police as a faction, but its a problem of whats possible to roleplay.