Helinut:
Yes I fly autogyros: ... I confine it to nice days. ... I am careful and keep well within the aircraft limits. Open cockpit is great, if you have not flown it before. I very rarely take it to the mountains (hills really) we have here, cos it is too light (which is a shame because I just love mountain flying).
This is the key isn't it? Knowing where they are, and double-watching yourself to ensure you keep within them.
I'm sure Cmmdr. Wallis holds tightly onto his designs because he knows punters definitely won't do that.
I won't dare you to try the legs over the side, and hands in the air trick.
The real question is the balance between risk and benefit/cost.
Yes, that'd be a good factor in the measure, but so woolly.
For most things you use a hele for you can't use a FW. I bet the FW accident rate for confined areas would be higher than for RW, but you know what, we will never find out.
Safety of fixed wing over cities compared to helicopters over cities: Single engine, yes helicopter must be safer.