"The Gebert operation was sophisticated, but it also was dangerous, considering that bikers have a menacing reputation and Harley owners in particular are known to be protective of their expensive bikes. So the couple packed guns, including one equipped with a silencer, "to embolden themselves" when they stole the motorcycles."
Any would-be thieves reading this should know that the "Other-than Harley" riders also are protective of their expensive bikes (in particular!), and many of US also pack guns, and have no compunctions about using them on ne'er-do-well's..........