"Jack Fetch" on SpaceBattles (hat tip to "Mr. Oragahn" of SFJ) asked a penetrating question recently.
Given the claimed firepower for even the fighters of Star Wars (e.g. multi-kiloton yields from the Saxton/SDN Episode II Incredible Cross Sections children's book), there is no reason why the Rebel speeders should not have been capable of any of the following:
1. Melt or vaporize huge holes in the Hoth ice so that:
A. ... the AT-ATs would fall in because you just melted the ice they were standing on.
B. ... a super-trench the AT-ATs could not navigate would be created.
2. Use blast effects to:
A. ... knock the legs off-course with direct hits, causing instability or tripping a la the tow cable trip wire.
B. ... "tip the cow", producing blast waves that would naturally produce the most force against the largest-area part of the AT-AT: the body.
None of these things occur. There is no logical reason for any of them to fail to work. You may even be able to make up more possibilities yourself.
Further, the fact that we saw dudes in the trenches without any protection also proves the point. If kiloton yields were being tossed about a small battlefield in aerial combat against supertall war machines, would anyone seriously want to be in a mere snow trench? That's like hanging out around Hiroshima and hiding in an alley on a particular day in 1945 . . . not a good plan.
There is no plausible excuse for any of that . . . even the full efforts of pro-Wars trolls and biased moderators at SpaceBattles were unable to thwart the reader's mind from reaching the obvious answer to the "Jack Fetch" question. Their evasiveness, subject changes, and unwavering belief in megaton firepower being in play only served to make them look even more like fools.
But if you have an actual rock-solid idea as to why I should still believe in high yields at Hoth, please let me know via comment. If your idea is crap, however, do not expect the post to survive. I will not suffer fools.