It was a different time. Security arrangements were just a lot more casual then.

And even today the Secret Service occasionally screws up. The recent assassination attempt against Donald Trump made that obvious but there are likely a lot of similar errors which never get exposed.

Security for a ex-president and presidential candidate is a LOT more lax than for the current President because the vast majority of resources is always going to be used to protect the current president. The situation where someone could get a sniper shot at the current President would never be allowed to happen.

>Why didn't they have agents in the buildings along the route?

Lol, I get it, but I'm pretty sure we've all settled on "just one shooter", or maybe "just one shooter, but secret service fumbled the AR getting into the car".

If you weren't making the reference I thought: some people believe that there were agents in the buildings around the route working together to shoot JFK - some with suppressed weapons and some without, so we wouldn't be able to easily localize where the shots came from by sound.

I think Oswald acted alone. I just don't understand why the SS made it so easy for him. JFK was served up to any sniper along the route on a silver platter.