Let me offer as weak defense that not all Americans favor gun laws as written today...but know that many of those laws are not federalized (ie, apply nationwide). The individual 50 states write and enforce the majority of gun purchase and ownership laws as only apply to the residents of those states alone.
So, as insane at it sounds to most outsiders, there are quite literally 50 separate but equal standards of enforceable gun laws today.
Only 5 of the 50 states regulate whom may purchase or own assault rifles, and all 50 states allow purchase and ownership of the handguns and shotgun) along with virtually unlimited stockpiles of literally thousands of rounds of ammunition, all of which were obtained legally by this latest iterated psychopath/sociopath.
And we then wonder why crazy people can manage to exploit such "laws", then "go postal" and shoot/maim/kill dozens of people in just minutes...
Going postal - Wikipedia, the free encyclopedia
*face palm*
Inevitably, at least initially, peaceful and reasoned people here ask "How could this happen"?
They then inquire, "What can we do to insure this never happens again"?
Short answers are as follows...
"Crazy happens", and can not be prevented (but can be treated, when identified in time)
...and...
"Nothing"
That's the ongoing tragedy in the US today...Aurora is but another all-too-frequent and tragic example that crazy people here can legally obtain, own and purchase as many weapons as they can afford, with a lone designed purpose to kill people, and will continue to do so as they please.
"Aurora" will happen again, someplace, somewhere, sooner than later...and given the national politics and powerful special interests that are entrenched today, there's nothing -
nothing- anyone can (or will) do to prevent it from happening again.
And that's the tragedy that no one here is willing to face...as horrible as it always is to confront and try to understand...
There's just enough of a fearful and ignorant populace remaining here adequately persuaded and convinced to vote against their own self-interests every election cycle.