Whatever we think, the world has a lot of 'abnormal' people in it and they will do what they will do and other people...deemed more in touch with reality will analyse and dissect and debate and argue over whatever happens.
The sad fact is one can never stop random acts by random people who randomly work out a plan to randomly or specifically do damage, kill or whatever.
It is O.K to say well somebody is to blame...at the end of the day...the person to blame is the perpetrator......
Yes we must take all possible steps to stop this happening again so is there going to be a total ban on guns in the US....No! So guns are available to ANYONE who wants one...if they can't get one legally then surely they are so plentiful they can be procured by crime or deception or just plain cash.
If you want to stop gun crime....stop guns!!!!!