"Why didn't the FBI follow him?"
Because if they did, leftist turds like you DUmmies would be shrieking and howling day and night about how it's "Racial profiling," and all officers involved should be fired and brought up on criminal charges for it.
" And this one *known* ISIL sympathizer can just obtain weapons and roll up on a hate rally?"
It wasn't a "Hate rally," you pitiful, melodramatic moron. Pamela Geller was presenting an award to the winner of her Mohammad art contest, and btw, the winner happened to be an ex- Muslim.
" We have either learned nothing from 9/11 or don't care about putting what we learned into practice."
Obama and the rest of you leftists are the ones demanding that we not do anything to stop Islamic terrorists out of fear of "Oppressing" those dear misunderstood people, and instead focus all of our country's anti- terror resources on imaginary right wing redneck terror groups and rodeo clowns wearing Obama masks.