My thoughts about withers are that they are too dangerous to ever spawn on survival in minecraft and if you do spawn them in creative keep them far away from the stuff you built and personally i think it is reckless that anyone would ever spawn a wither in survival with out diamond armour and weapons it woud be stupid anyway just dont spawwn a wither in surviva with out good equimpment or you will die anyway in creative if you have built nothing it wouldprobably be best spawn a wither thn in surviva it would be as hard as crap. seriously though withers are dangerous and should not be taken as non threats