It is wrong and NO, you can't opt out of it. You cannot opt out of the presidents personal forced line of communication with you. You can only opt out of the AMBER and FEMA alerts.
This is the equivalent of forcing you to subscribe to instant alerts from my twitter feed. I haven't found anything regarding what the president can and cannot send to me, and truthfully, I don't want him sending me or my kids unsolicited messages.
If only we could all opt out of your messages too.
This is exactly why it's mandatory-- because of ignorant people like you who think the President will start sending you his campaign messages through it. They're protecting you from yourself by not letting you turn it off.