Quite an interesting history of the term 'moral panic'
en.wikipedia.org/wiki/Moral_panic
From what I can tell, people seem to be suggesting that collective societal anger on an issue is classed as 'panic' and generally a harmful thing. Although the listing of 'mass shooters' as a subject of a moral panic seems reasonable to me - it is immoral that children/terrorists have access to guns and a society that makes it possible for mass shootings to happen repeatedly should outrage anyone, imo.
I note that there seems to be no notice given to collective non-violent, democratic change making, which could also be said to be driven by 'moral panic', surely?
People become aware of an issue, lobby govt and media for change, change happens. It's not just acceptable, it's an integral part of a functioning, healthy democracy.
Of course, not everyone will agree on what is and isn't acceptable. So label some causes 'moral panic' and some 'social justice activism' etc.
Not sure I find the concept that useful. Perhaps focussing on how to make sure that information is accurate, critical thinking is applied, and change is done efficiently, fairly and democratically would be more useful? Dismissing people's concerns as 'moral panic' seems defeatist, arrogant and judgemental, to me.