Yep. I live in CT and have had Biden or Dr. Jill visit a few times. Local/state PD usually handle things like road closures, traffic and extra eyes on the area outside the USSS perimeter. A family friend was on one of those details on a Clinton or Bush 43 visit.
Even then they had direct contact with some command post or what not, so if they had sometime come up they would radio it and local dispatch AND USSS could hear it talk to them if needed.
In this situation, they may have cleared the roof/area early on, however once someone got on the roof, the snipers were in a much better position to respond than a patrol officer on the ground. Why such a delay occurred in the response is the real question.
Quite making excuses for complete incompetence all the way around. It’s not a good look for YOU.