How about if someone tells you the person is a lunatic? You know, like how folks told the FBI and local law enforcement that Cruz was a lunatic about a dozen times?
There appears to have been a terrible failure, one of thousands occurring daily, of law enforcement to act to protect the public. So what's new. Your police are too busy writing you a 150$ ticket for an expired inspection sticker to be bothered tracking down a lunatic with an AR-15. How much will the justice system make from doing that? Probably a net loss.
How hard is it to install a bump stock, trigger crank, 3mr trigger, or machine an AR lower to m16 spec? Sure lots of the above apply to most carbines and semi rifles, but therein lies the problem. You're starting off with a 90% weapon designed for armed conflict.... With better range and higher energy round than a pair of pistols.
Or too busy chasing a Russian narrative for the FBI to pay attention when someone gift wraps an extremist to them.
It's a lot harder than you think. Why don't you do the research and come back here to tell us - with specifics - how easy it is to obtain, get the knowledge and then implement said changes to a weapon you also have to obtain in order to achieve a substandard aiming platform?
Bump stocks don't make an AR anywhere near as capable as an M16 due to jamming and highly degraded accuracy. Trigger cranks aren't much better and good luck trying to machine an AR's lower receiver. Take the latest M16 and remove only the auto or burst capability, leaving everything else as is. The remaining features and attributes that make it more suitable for combat than the Ruger Mini-14 are of no benefit whatsoever to a school shooter. And they are things like: the flash suppressor, bayonet lug, ability to mount a 40 mm grenade-launcher; and superior durability, reliability and maintainability under harsh (wet, dirty, dusty, etc.) conditions. That's what makes it "designed for armed conflict." Plenty of hunting rifles are far more powerful than an AR and more accurate. The VA Tech shooter killed 32 with two semi-automatic handguns. Ban those too?
Seattle police first in state to seize gun under mental health law http://komonews.com/news/local/seattle-police-first-in-state-to-seize-gun-under-mental-health-law The city’s police department became the first law enforcement agency in the state to force the surrender of a firearm under a new law known as an “extreme risk protection order.” The incident involves a man who lives in Belltown, who neighbors said had been intimidating people for the past year - even staring-down customers through store-front windows with a gun holstered at his side. Mental illness is suspected, but that new law allowed police to legally disarm him. “He was roaming the hallways with a .25 caliber automatic,” said Tony Montana, who knows the man from his apartment complex. “And it created a lot of fear obviously because I didn't know if he was coming after me or gonna just start shooting the place up." The man, who we are not naming, is also well known to the bars and restaurants below his unit along Second Ave. The volume of complaints convinced Seattle police to seek an extreme risk protection order - or “erpo” – which allows law enforcement to legally remove guns from people deemed a danger to themselves or others. In this case, the man refused to comply. Because of the new law, police were then able to return with a warrant and force the man to surrender the firearm. “I’m very supportive of this law,” Montana said. “This is a perfect case in point where it's had some efficacy. It was an immediate crisis and law enforcement was able to remove his firearms, so it very well could have saved lives." A few dozen erpos have been served and executed around the state, but Seattle police said they are the only agency so far to seize a gun because the owner refused to hand it over. Law enforcement professionals said these specialized protection orders could be a common sense strategy to try and prevent mass shootings - such as what happened in Parkland, Florida. “There's certainly a big concern of the connection between mental health and people exhibiting violent behavior and whether or not they should have access to firearms. The ‘erpos’ give us that tool now as an option,” said Sgt. Eric Pisconski, who leads the crisis response unit for the Seattle Police Department. The confiscations only last a year, although they can be renewed.