I assume secret service has protocols to wait up to and basically right up to the exact moment of action by an attacker. Even though it should be common knowledge that you cannot do this because of basically what we saw today, surely tons of people do things like climb nearby buildings and maybe even setup like tripods to photograph or video politicians. The secret service isn't just gonna brain some guy 150m out if there's any chance he's not doing the damn thing. Of course they should've had local police or secret service at that location either on the roof or blocking access. Crazy that this was allowed at all. Crazy that the shooter seemingly knew he could get away with it. Maybe he saw how secret service guarded the area in the past or just got lucky. This whole thing is gonna fuel so many crazy conspiracies for years to come