I have to agree with most of the posters that most people who do not carry have no idea of a "print." Most see it and think it is a cell phone, knife or some other device other than a gun.
However, I can pick out a print in a split second only because I am conscientious of it because I carry. Most people that carry can also but obviously will never say anything.
The Second Amendment is a doomsday provision, one designed for those exceptionally rare circumstances where all other rights have failed -- where the government refuses to stand for reelection and silences those who protest; where courts have lost the courage to oppose, or can find no one to enforce their decrees. However improbable these contingencies may seem today, facing them unprepared is a mistake a free people get to make only once." -- Justice Alex Kozinski, US 9th Circuit Court, 2003