You know you can disable that. It might be against the law though, and it isn't the EVs that demand noise, it is the society that demands them not to be silent killers. Even Hybrids have to make this noise when they are running on their electric drive trains.

But let's say ICEs were made as quiet, they would be demanded to make noise as well. Also, no one has done anything about tire noise yet, so at high speeds, EVs and ICEs are about the same.