It's not about mockery.We've been granted free will - the only way to take away the harmful effects of people's bad choices, is to take away free will itself.
It's true that prayer doesn't do anything to change the status-quo. Most aren't naive enough to believe that enough prayers will force God to put an end to gun violence. It doesn't work like that. We are praying for those mourning that they might find comfort. We are praying for the survivors that are still living in fear - and still have psychological obstacles to overcome as they deal with the traumatic experience. We are praying that they can find peace, and hope, and strength. We are praying for their recovery. But continue on in your mockery of people's sincere efforts to understand, connect, and empathize with those that are suffering.
But I'm sick of empathizing with those who are hurting from needless violence (although I do); however, I'd prefer we'd need not empathize in the first place. I can just imagine our prayers for hope, strength, and understanding being heard by a God that is returning the sentiment back to us and hopeful that we have the strength and understanding to fully embody God in the world in bringing about a fully realized vision for God's love and peace within it.
I believe in a God that, when we weep for our children hurt by needless violence, weeps along with us; and when we ask where God was during yet another tragedy like this and why God didn't do anything, God is asking us why we haven't. I believe in a God that is active in the world in and through the ones that embody God. Not in one that bippity-boppity-boops things from somewhere far away while we sit back and pretend to be helpless.