An ethical argument could be made that by watching we are encouraging the behavior and therefore share any blame if something goes wrong.

He’s a grown man. And clearly intelligent. It’s disrespectful to be that patronizing towards him

what about driving cars.

are you against that as well?

Cars are necessary in modern society. Furze's stunts are not. We might reach a point in the far future where we are no longer reliant on cars, but we're not there yet.