I am in favor of the right to bear arms, but toting an assault rifle, particularly if it is loaded, at a political rally is chilling. Supposedly the person had no intent to use it, but suppose some kook had wrestled it away from the person and open fired? You could hope the police would be able to stop it in time, but there are no guarantees. Innocent people could be harmed. Apparently the person was outside the building where the President was speaking, and was not (thankfully) allowed inside. But it certainly could have been intimidating to people who wanted to attend the meeting in the building. We can express our views and differences with words and placards. To me, carrying assault weapons to send a message is way over the top.