That's what Hamas vow to do and you don't criticize them for it just like you don't criticize Hamas' stance against peace, their use of war crime rockets, their gunning down civilians at bus stops, or even the abuses they subject the people of Gaza to..
You don't criticize Israeli politicians who vow to take all of Eretz Israel, do you?
I criticize based on real crimes and acts, not 'vows'.
Were Hamas to kill 300 protesters in one year and injure 14,000 I'd be on their ass instead.
But they haven't, Israel has.
Hamas rockets are war crimes, yes, as they can't be aimed only at military targets and are indiscriminate. I fully support them being investigated and charged as Israel should be for the 2014 Gaza attacks, the blockade, illegal settlements, killing protesters and apartheid.