How many of these mass murderers and serial killers are mentally deranged to the point of homicide? Nearly all of them.
In almost every - but not all - cases there is nothing about any racial or national origin nor religious hatred. There is just a totally insane perp who goes to the easy places to find victims. That is to gun free zones like schools, theaters and churches to find what they want - completely defenseless victims.
Oh and by the way, the President said they don't have these events in other western countries - well, Mr. President, the list of these events is very long and only occurs in about 35 other western countries - perhaps you just didn't notice or your researchers are lying, through you, to the American people when they wrote that speech.
Here's the very short list the President overlooked in HIS ZEAL to make this political
Behring Anders Breivik killed 75, 2011, Norway
Mohammed Merah killed 7, 2012, France
Genildo Ferreira de França killed 14, 1997, Brazil
Michael Robert Ryan killed 16, 1987, UK
Eric Borel killed 15, 1995, France
Friedrich Leibacher killed 14, 2001,Switzerland
Christian Dornier killed 14, 1989, France
Ljubiša Bogdanović killed 13, 2013, Serbia
Derrick Bird killed 12, 2010, UK
Robert Steinhäuser killed 16, 2002, Germany
Tim Kretschmer killled 15, 2009, Germany
Wellington Menezes de Oliveira killed 12, 2011, Brazil
Bai Ningyang killed 12, 2006, China
Juhani Matti Saari killed 10, 2008, Finland
Huanming Wu killed 9, 2010, China
Ahmed Ibragimov killed 41, 1999, Russia
Ami Popper killed 7, 1990, Israel
Antoní Blažka killed 6, 2013, Czech Republic