REGARDLESS of if the shooters were black,white,or zebra-striped,if you had tried to tell someone 30 years ago that this sort of thing would be happening often in the early 21st Century,nobody would have believed you.
Now none of us are even shocked.
How many of you remember the sniper in the bell tower at a Texas University back in the 60's?
This was just one guy doing the shooting,and it was "We have to interrupt your regularly scheduled program for this breaking news report." VERY big deal. That guy probably wouldn't make the cut for top ten stories of the day,today.
BTW,before anyone suggests it,the guns of today are not one bit more anti-social or aggressive today than they were back then.