I get that the chance is very, very, very small. But unless there is no chance at all there is still a chance. All I am saying is that there should be a check to make sure that a new address does not exist already.
There's also a chance your dollars will spontaneously combust... Checking is a waste of time, and if the address already exists when you generate it, then
you're the one who gets to steal the previous balance of the address.