Marxist Hacker 42's Journal: Which of these things is not like the others

Moveon Edition:
 
 

After months of promises that, in the wake of Newtown, this time would be different, congressional Democrats, led by Majority Leader Harry Reid, are on the verge of caving on the three most critical gun violence prevention proposals: universal background checks, a ban on assault weapons, and a ban on high-capacity magazines.

 
and later in the same letter
 
 

What's looking most likely to end up in the final bill? A provision encouraging guns in schools.

 
It appears to me that neither side has been listening to the other AGAIN. Only ONE of these four proposals stands any chance at all of reducing random mental-illness driven gun violence. Can you guess which one? The other three stand no chance at all of doing anything for the problem other than annoy people.
 
Your wing nuttiness will be based on your answer, but here is a hint: The real cause is mental illness, NOT guns.