Well, what proof do you have that haste is better than crit? Dps parse of you doing ground breaking dps in full haste?
Frost is almost global capped, it already has pretty fast wep swings, therefore the gains from haste are:
1) Faster rune regeneration - wasted due to being as good as capped on your globals
2) Faster white swings - gain on 1 attack, minimal increase due to already decent wep speeds
Crit outside of km will give increased damage on white swings, frost strike, non km procced attacks and hb.
These are the reasons why, the proof of this are in the sims and the dps parses, unless you have some solid evidence to counter this well documented information do not go around misinforming the dk community.