i think we can all agree a mass shooter has callus disregard for life.  Bringing Roe v Wade into it is a completely different argument...which starts with what defines life (there are differing opinions) and some (guessing you) would argue any abortion is callus disregard, while others (me) would suggest forcing an unwanted and/or dangerous pregnancy resulting in a forgotten child could be characterized as callus disregard.  And it is my respect for that difference that has me supporting a woman right to choose, rather than imposing my position.

Mass shooters on the other hand, there is no counter argument, just evil intent.