Playing the Devil's Advocate. As I've said a huge % of Americans feel their 2nd Ammendment rights are extremely important to them. So, if we are saying - general consensus - that stricter gun control measures will NOT stop mass killings / shootings, do they have a valid point in saying that why implement these measures if those asking for these measures to be brought in, concede the mass killings will carry on.
Someone accused me of " not knowing America " might I strongly suggest that if people genuinely believe more gun control measures will be brought in, they are deluded. It just isn't going to happen, ever.