Let's look at it logically. Everyone here knows that a UBC would do nothing to stop the morons who want to become famous. However, the media and certain politicians have convinced the majority of citizens that a UBC law would fix everything. Even Trump is wavering towards this. (ugh)
So, to make the voters happy, a UBC law passes and Americans feel safe again..... until another moron wants to be famous.
So, with the UBC law in place, the same media and politicians convince the public that the UBC law has no teeth without registration. How can we prevent carnage if we don't know where the guns are?
So, step 2 would require registration of ALL firearms, not just new purchases/transfers.
Step 3, we all know what registration leads to. The left knows they can't get what they want in one fell swoop but if they keep taking an inch here and an inch there, total registration and confiscation is just a matter of time.
Now, it is estimated that there are between 300 million and 500 million firearms in the hands of the American people. Good luck getting those registered if/when the day comes. This will open up the black market even more than it is now. The bad guys will still be able to get guns and the good guys will be forced to give them up.
SO, long story short.... a simple law like a UBC is the first step to mandatory turn ins of all firearms in a decade or two. It has history behind it. It we keep giving to make them happy, pretty soon there will be nothing more to give.