It is simple, lack of content for squads.
As many have identified above, there is more attracting stuff to do as a criminal, more options for gameplay. Like the only thing for cops that is non-criminal reliant is the VIP escort as we can do that alone, however to make it fun, it does require criminal activity. So we are purely relying on people playing as criminal.
There needs to be more ingame scripts/activities for cops to do without requiring the need for people playing as criminals.
Squads are dieing, its VERY hard to keep people interested and gain new members. Everytime someone leaves the reason is 99% of the time, I am bored and want to play as criminal. So what can we do to convince them? We cant as we have nothing to convince them with.
Once squads die, than it will just kill the server as than criminals will get bored. So yeah, SAES really needs to think of something and develop it fast if it wants to keep its squads alive for longer.
Also one big part of the police side was the ROLEPLAY but lets be honest, roleplay has disappeared from SAES. No one really does it anymore because people cant be asked anymore. People are now just like, oh well its an RPG server so its not pure roleplay is it......
Well it was and thats why a lot of people have left, because roleplay has gone and that was one of the reasons for MANY people joining cops. To do police roleplays.
One idea for a script could be, if cops prevent a BR from completing than a transport mission should occur to collect the money from the Bank that was being robbed and drop it to a secure location, or another bank. That is becasue the bank being robbed is vunerable and needs repaired due to the damaged caused by criminals. So in the mean time the money is moved to another secure location. This is a way to reward squads for preventing the bank from being robbed. The payout could be 50k per squad member.