Projection is the attitude I run into a lot. I've heard a number of people go on about how people shouldn't have or shouldn't carry guns. This is usually followed by something along the order of, "If I had a gun I'd probably shoot someone over..."
If I had a dime for every time I've heard that line. Usually I look at them with an incredulous expression and say "Man, you need to go in for some anger management counseling 'cause I'd NEVER do that!""If I had a gun I'd probably shoot someone over..."
That's really similar to the "if you don't believe in a god what's keeping you from killing people" line that gets thrown at atheists at times. I always tell them if that's the only thing keeping them from killing people I hope they hang on to it."if I had a gun, nothing is stopping me from killing anyone that makes me mad."