Big difference between an armed to the teeth guy shooting 20 unarmed 6 YO and inner city gang kids who are usually both armed killing each other... Both are awful situations, but if you look at the 2 objectively the former deserves more outrage.
30-40 years ago when there were Mafia wars in NYC and they were killing each other it made the news, but as long as the armed killers were killing each other, no one really cared. Gang members and drug dealers killing each other? No one really cares..