That's fine but his agenda doesn't mean anything to those that already lost a child. This is not the time. IMHO.
Its the perfect time to take actions to prevent another attack. 'Never again' is a perfectly acceptable sentiment at a memorial or after a tragedy.
I personally no matter the politics I would not want to hear it. Having experienced it, I wouldn't want my child's death politicized. It is about the lost ones not political BS.