I assume you mean rationale.
It is that as a culture we agreed that some guns are more dangerous. Regardless of how misguided or correct that notion is, we agreed as a society that some things are just a bad idea and should be outlawed. Letting it fade out was a sign that culturally we had shifted to a permissive attitude towards this type of weaponry being in the hands of the average citizen.
Regardless of how toothless the ban was, it was a symbol that there are boundaries.
Now, can I get your rationale as to your little rant about big brother and the second amendment? And how it was a good thing?
Oh yeah? What guns are more dangerous? Looking at the 1994 assault weapon ban, it is obvious that the politicians have no idea whatsoever what's "more dangerous". The shooter today used a Glock and Sig. Handguns are the *least* effective weapons you can possibly use, given a choice.
In any case, I fail to see how society's overall ignorance (or as you call it, agreement) regarding the 2nd Amendment's true intent, i.e. the ability of the average citizen to own any weapon the government can own as a safeguard against tyranny, should infringe on the rights of the remaining people who do understand 2A.
But in that sense, 2A is already dead, because only rich people can own fully automatic M16's and SAW's. Laws are for poor people.