That's true but the players are paid to win, almost at any cost, whereas the referees are actually paid to enforce the rules.
In an ideal world they'd be no cheaters at all, so no need for a ref or really many rules at all, however that world does not and will never exist.
Changing or re-writing any rules that they don't currently properly understand or enforce is not the solution because it does not fix the actual problem. All it does it confuse things and add even more rules for them to get wrong and that will ruin some games and actually end up causing more problems for the referees.
Meanwhile simple changes that would actually make a real difference in some games, such as using TV pictures (where available) to spot the ball in close call penalty decisions or just awarding a goal for any handball offence that stops a clear goal, rather than give a penalty and encourage someone to cheat because they might get away with it, even if they are caught, are still not even considered as potential changes.
Of course we just get gimmicks like the vanishing spray that the referees are already not bothering to use most of the time, you know like the rule that they brought in where they could move free kicks forward for various things but just didn't bother with it after a while or the six second rule for goalkeepers that's long been forgotten unless it's the 90th minute.
In short, I agree that some of the player behaviour is awful but don't subscribe to the "the players are always naughty and the referees are always right" way of fixing it. The attitude the governing bodies and match officials give off is as disrespectful to the players as much as the players are to them, how is that going to fix anything.