The actually shocking part is that the president views drone stricks, which is to say extrajudicial murders in foreign countries, so casually he thinks it's appropriate to make jokes about them.
I'm generally a strong Obama supporter, but this is one area that I feel like his actions were totally indefensible. I'm not surprised by his callous attitude on the subject.
I am pretty sure it is not a new technique - it was famously featured in the 2010 children's book Mockingjay, and I am sure Suzanne Collins didn't make it up either.
Double-tap bombing are a staple of the asymmetric warfare arsenals of spec-ops forces/guerilla/terrorists since at least the second world war, probably much longer.
(Also, it is rather unlikely that Obama ordered the airforce to start double-tapping, or even that he knew ahead of the fact, given the amount of extrajudicial killing/assassination the US forces do every month...)
If he wanted to make a dad joke he could have said he had a shotgun or would box them or challenge them to a duel or something. That implication of superiority with balance can be funny, like Mike Tyson joking that he was going to kick your ass if dated his kids. Enough of a flex, but the balance is maintained because if you train hard enough or knew enough kung fu maybe you could take him.
Joking about firing people and calling a drone strike on them are not funny if you can actually do it but they can't do it back to you.
Think of holocaust jokes.
https://news.ycombinator.com/newsguidelines.html
Edit: would you please stop posting unsubstantive and/or flamebait comments to HN? It looks like you've done it repeatedly, and it's really not what this site is for. If you'd review the guidelines and take the intended spirit more to heart here, we'd be grateful.
https://abcnews.go.com/WN/president-obama-tells-joke-jonas-b...
(Not singling out that President, but the incident was shocking.)