@Asta: If you do not mind...

I generally support the notion of a GM having absolute power/my word is law for a couple reasons.

#1: It exposes good GM's who communicate from bad ones who punish near instantly in most circumstances.
#2: It gives me the power to deal with problems or enforce systems as necessary. (For instance, a strong theme in my role plays is that anyone can die. There is little to no plot armour. It would be excruciatingly hard to enforce this without absolute power.)
#3: A GM has absolute power... But only in their thread. If a GM turns out to be garbage, you can simply leave and join a new Rp. You can also make your own and become the dictator yourself, if you want.

Basically: I enforce in my own Rp's and support GM word is law because the GM's role is, by definition, the arbiter. They make the world and plot, and it simply helps to have a central authority figure. Especially if a moderator has to be called in for help, and especially since if a GM is bad, you can just... Leave. Go find a better GM, or become a better GM.