The world is filled with violence. Because criminals carry guns, we decent law-abiding citizens should also have guns. Otherwise they will win and the decent people will loose.
Psychology is still trying to explain the perception of the position of an object in space, along with its shape, size, and so on, and to understand the sensations of color.
I have asked myself once or twice lately what was my natural bent. I have no doubt at all: It is to look at each day for the evil of that day and have a go at it, and that is why I have never failed to have an acute interest in each morning's letters.