Ice pack :
It is worrying then that ATC are now putting aircraft at risk. I wonder if this fact will be a factor in this instance.
Again , you do not seem to understand that ATC is not there to put aircraft at risk regarding weather. ATC has another function , proactive weather avoidance is not their task. Also you have to realise that most ATC centres do not have weather radars superimposed on their radar displays.
In this case, ATC allowed the crew to deviate horizontally, as requested. The climb was delayed , but for the correct reasons. If the crew percieved a risk, they could easily have overuled ATC and climb, (and maybe they did) .
From what I have heard so far, I am not sure weather alone is the reason of this crash . But a bit of patience, with both recorders recovered now we probably will know soon enough .