You act as if he threw the pitch at a game in Baghdad. Let me refresh your memory he was riding a wave of high approval after 9/11 and I don't think the atmosphere at the game was one of high assassination danger.
Also, in regard to the shoe, do you realize this was in the green zone and anyone allowed access to that conference went through multiple levels of security and searches? The risk of someone having grenade or even a knife or explosives in their shoes was extremely low to non existant. He wasn't strolling down the street in Sadr City.
In regards to your first statement, Im sure everyone thought Fords theater was safe in April of 1865. It's a public play in D.C, not a battlefield in the south, right? What could be safer unless it's a public book depository in Dallas Texas? How about a fundraising dinner full of Democrats in Los Angeles at a posh hotel? Ask Bobby Kennedy how safe it was. I'm sure the security was just wonderful at those venues as well. All it takes is luck and a willingness to trade your life for your targets. These people have demonstrated that willingness time and again. Wake up.
Lincoln's popularity was at an all time high at the time of his assassination( in the north at least).
John Kennedy, Ditto
Ronald Regan, attempted assassination,Ditto
Bobby Kennedy, popular
Roosevelt attempt, Ditto
Attempt on Harry Truman, Ditto.
Pope John Paul 2, most popular Pope ever at the time of his assassination attempt.
What has popularity got to do with being assassinated? If anything it makes you more appealing as a target. Just admit it. It took some courage to do what the man did. Don't be so blinded by your dislike of his politics that you become jaded to everything. Or is it only us right wingers who keep our sense of humor and objectivity?