The gun lobby has won the battles. They've gotten the policy regime they want.
The onus is on them to make some sort of token effort to address the problem of random massacres. To aid in wrapping the national head around the enormity of the problem of understanding these things and preventing them. The ball is in your court. Nothing is not a response, and politically, a response will be demanded.
Liberals have a majority big enough to elect a president, but not nearly big enough to enact meaningful legislation in this area. There is no "gun-grabbing" on the horizon for the forseeable future. Zero. It won't happen, because it can't happen. But clearly, there will be--is--a mandate for something. Yet nothing can happen without support of at least some fraction of voters who oppose all gun regulation, without some fraction of the political gun lobby & industry, and without some fraction of lawmakers.
So we're at an impasse. We need creativity.