I get what you're saying and I think you're a valuable voice in this thread, but you gotta think about how weird your argument is.
The POTUS is the most powerful man in our country. His words can dissolve nations. His penstrokes can change lives. He is responsible for the economy, education, the military, etc. If our country got attacked by Canada tonight, he would be in charge of ensuring swift destruction of their entire country.
...but he can't get around rain? Seriously, think how crazy that is. The same person we have to make our country function in the face of terrorism can't even keep to his schedule in the face of rain?
If a friend bailed on a party because of rain, I'd be disappointed, much less the leader of the free world bailing on a commitment to our country's veterans.