Yes they are, and that's an entirely different situation.

People who are deaf have learned to work with their disability, and reduce the inherently increased risk of not having auditory cues -screeching tires, honking, emergency sirens, etc. That is a life skill for them.

OP, on the other hand, was asking about whether it was dangerous to voluntarily block out those cues in a situation which is already moderately risky (driving), and implicitly is someone who hasn't developed the compensating skills.

The question was 'is it dangerous?' It absolutely is, as well as stupid and in some cases, illegal.