As you said before, the problem is a mindset one, not a rules one. When we were only 20 people strong, even the antags didnt greytide despite a non-existent security force. Every player who was on MRP was there because they CHOSE to be on the MRP server and play an MRP round. No amount of rules will change the mindset of an LRP player because they are just that. An LRP player who’s on the wrong server.
If we want to fix the problem from its very root, we should actively try to get people to stay on the LRP server, then anyone who actually wants to MRP will have to take the extra step of hopping into another server. With higher population and maybe a whitelist on MRP, LRP will become the default server for anyone who’s not actively into MRP.
Anyway, as for the original question of this thread, I would say that trespassing is the biggest offender. This is especially true for science, medbay and the kitchen. Most people will simply break into science for that sweet BoH or into medbay storage for a health analyzer and a surgical saw. I dont know what others think about this, but I would ask to make these offenses ahelpable. At least dont break into the kitchen to make a pizza just because the chef was busy grabbing a corpse and you were too impatient to wait.