It's Christmas/New Years. GMs have lives too, and don't play 24/7.
Also bear in mind that the game is free, so your sense of entitlement is a bit misplaced. Getting what you pay for and all that.
Seriously, if its that big a deal to you, level to 20 and go to the next PvP map where everyone has hats and its not that big a deal.
Hats make people stronger, not immortal.
1 in 5 children online gets eaten by rabid bears. And you didn't even know bears could type.