> I am a bit stunned reading this.. Is this a common perspective of motorcyclists?

No.

For example, every beginner-advice thread in /r/motorcycle has a highly-upvoted comment(s) recommending ear protection, including many folks stating they wish they had started using it earlier.

And even if it is conceded that sound may not save you from other vehicles, ear pro(tection) reduces the health risk of hearing loss that would effect other aspects of your life.