Of course he has security, or course people could obtain weapons and try to kill him.
The point is, in our nation, even with security, our leaders can't march down the street with a million people in protest. They're too afraid of dying. Castro's not. He has balls. Cuba's not a great country, it's a pissy little island nation like our commonwealth Puerto Rico.
The point is Castro is loved by many of his people, and can walk down the street. He told the powers that be to F-off! and lived. It's freaking hilarious. It's a unique fact of modern American history (America doesn't end at the Rio Grande, there's central, south, etc.). Moreover, the fact that Castro can walk down his streets and that he has balls makes people squirm (scroll up), is even sweeter.
I'm from Texas. I like outlaws.