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>>So, we force these killers to use other methods. Maybe like the Bath School - no guns - 45 dead or Columbine High School which kill 12 by guns but only because the two 20 pound bombs they had planted in the school cafeteria failed to detonate. Or, maybe something smaller like the pressure cooker bombs use in Boston - small enough to be carried in a backpack right in front of all kinds of security - 3 dead, 16 more lost limbs, and about 250 with lesser wounds. Pass more laws and force them to get a background check before they buy propane. Then pass more laws and force them to get a permit to shop in the cleaning supplies section of the nearest Walmart. Then pass more laws and force them to register for the fertilizer section of Lowes or buy chlorine for their pool. Then pass more laws ...... And I haven't even got to auto stores and pressurized cans and I guess down to chicken sh*t - lots of nitrogen there - enough to make an explosive if I remember correctly from my field expedient explosives classes .
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>I'd say for most people it's a lot more difficult to make an effective bomb than get a gun. In the meantime, I can't have a bottle of water passed through airport security.


Washington Examiner -23 hours ago - Transportation Security Administration officers found the highest number of guns at airport checkpoints ever recorded in a one-week period earlier this month, the agency announced Tuesday. A total of 104 firearms were uncovered in air travel passengers' carry-on bags Feb. 5-11, according to a press release.

The last numbers I saw was that during testing the success rate was about 20%.

On making bombs - difficult maybe but far from impossible.
Manchester Arena May 22, 2017 bomb 23 dead 500+ non fatal injuries.

I think that if you look at the people that do these mass murders that they don't just get up one day and decide to go to a school or a concert and shoot somebody. They plan, stew, become obsessed, give warnings and then plan and stew and become even more obsessed for months even years before they commit the crime.