Assuming they have enough fuel margin they could probably just fly back up a few meters and try again in the rare case of an unexpected event causing an imperfect landing approach. Doesn't seem much worse than a helicopter in that regard.

I agree it'll probably be quite a while before they reach that level of safety though. This is brand new technology, and it's not going to reach the level of reliability of traditional aircraft without decades of experience with different failure modes and techniques for mitigating them.