I think part of why gun grabbers are so upset right now and dreading the SCOTUS ruling on the "assault weapon" ban cases is that they know that they're one of the political movements that is one unfavorable SCOTUS ruling away from getting mostly destroyed.

There's several of these. The gun grabbers are definitely one, the secularists are another, there's a few more of those too that all it will take to put them up shit's creek will be an unfavorable SCOTUS ruling.

When the SCOTUS inevitably strikes down "assault weapon" bans pretty much everything these gun grabber types have on their agenda becomes a much steeper uphill battle for them. Keep in mind that these groups get tons of money every year, use that money both for litigation as well as funding gun grabber candidates, etc. If that big money keeping this shit afloat decides after an unfavorable SCOTUS ruling that this isn't a priority anymore for the time being, and they'll revisit it later on when the SCOTUS has a more favorable makeup, a lot of these groups (and the careers of their leaders) are cooked.