I'd wager you not a single right-winger saw that video and thought "we need to ban guns". They're thinking "I need more guns to protect me from this kind of leftist violence".
The response to the last high-profile public shooting was, if you’ll recall, noise in the DoJ about taking gun rights away from transgender people. So some kinds of gun control are apparently on the table.
These people aren't mellowing on their position on 2A; they're instead starting to think "Hmm maybe some of these 'people' shouldn't be considered fully people from legal point of view ..."
All my life I’ve heard conservative talk radio types (and more recently, conservative influencers) chant “shall not be infringed” as a mantra and oppose any restrictions whatsoever (at least, post-Reagan; see the comment down-thread). That old state of affairs has subtly changed.