F1 could easily be faster if the regulations allowed, remember an F1 car is a 2.5 - N/A - Imagine what they could do with turbos, and more capacity - an F1 car is also slowed down considerably by downforce.
As has been shown in the past, high speed is very dangerous in a competitive environment.
TBH Though I think the technology that has allowed F1 cars to be as fast as they are with what they can use has led to these supercars - if the regs where lifted on F1, Id hate to imagine what the teams would come up with over the winter, but I bet it would knock the socks off any production car