If that Reddit thing is actually true - which, well, it's Reddit, so I hope we're all taking it with a lot of grains of salt - then it would explain the band's reluctance to go ahead with the St Louis show without a full complement of police and security.
Anyway, cheers for reposting it in a readable form here, PRB216.
Happy to help!
I'm now doubting the Reddit claim heavily.. The Redditor claimed the extremist "attempt" happened weeks after the Charlie Rose interview (Sept. 20, 2016) but the band played at iHeart (Sept. 23, 2016) & Dreamfest (Oct. 5, 2016) without issue. They were rumored to debut The Best Thing on 09/23 at iHeart so something else must've stopped them from playing new material (and thus committing to promo it beyond those two dates).
And as Headache mentioned it'd be very hard to keep something like that out of the news/courts/police blotter while medical records are very private and tightly protected.