Several factors drive this. First, by their nature, bikers tend to be politically conservative….
Second, bikers also tend to be an extremely patriotic group and, today, they are sensing that something is terribly wrong with our country and that, if changes are not made, we will soon be in an irreversible state of moral collapse. They also see the legalization of abortion as a symbol of that moral collapse.
Third, the typical biker abhors both cowardice and injustice, and the predominant feeling among them is that abortion is a textbook example of each.
[Photo (click to enlarge) of Bikers for Life at the January 18 Dallas March for Life]