Because I think of Jean Eugene Robert Houdin stopping a war with his magic performances. Think of what that means. Not only does it mean that the people who were starting that rebellion respected the performance enough that they lost their nerve to rebel, but it also means that the government of a powerful nation decided that their -best- strategy was to send a magician to stop the war. Imagine the level of respect for Houdin that these actions imply.
But now we've got people like The Magic Crasher and Carbanaro using magic to ... pull pranks. Let's make a video of this dude sitting on an invisible chair at a muscle beach. Hilarity ensues!
And magicians wonder why people think magic is lame these days? Why should the general public respect magic when magicians don't?