There's an inherent risk in any venture like this. AirBnb hosts put some level of trust in their guests when they let them enter their home. Even Lyft drivers put themselves out there just as much as their passengers do.
By sharing your car through Turo, you put a certain level of trust into the world. But it seems to me like the benefits outweigh the risks, so long as you invest in premium insurance protections.
When you need cash but are strapped on time, I think listing your vehicle through Turo's car sharing software isn't a half-bad idea..