[CW: Live local coverage ( has graphic images but blurred)]
spoiler
https://www.cbsnews.com/newyork/live/
Possible suspect has been identified.
Suspect fled Brooklyn subway wearing construction vest, gas mask; at least 5 shot, 13 injured
https://twitter.com/1010WINS/status/1513879910783279121
[CW: Racism/Mental Illness] Frank R. James ID’d as person of interest in Brooklyn subway shooting, made threatening online rants
https://nypost.com/2022/04/12/frank-r-james-idd-as-person-of-interest-in-brooklyn-subway-shooting/
I think it's coherent to say that "arm the workers" and "indiscriminately arm everyone" are two different things. In the US guns are overwhelmingly owned by right wingers and cops, so repealing 2a and taking them would be a net positive.
It does leave the problem of what to do when you actually have a mass working class movement, but historically those movements have been able to arm themselves when the time came, usually by raiding a government armory.