Ear plugs are a good thing, HOWEVER: I find wearing earplugs in a full face helmet keeps me too oblivious to things that I need to hear around me. Especially sirens of police and fire vehicles....
I agree... The only time I wear earplugs is when I ride without a fairing or helmet... then, they are necessary to keep the wind out of my ears, especially on colder days. Hey, I like riding my 2006 Kawasaki Concours without a helmet, its enjoyable on a nice, summer day. And, in my area, its a Choice...
Now being a retired pipe welder in the construction industry, when I started there wasn't any OSHA or any requirements, and so we wore earplugs if they were even provided by our employers. Now, they are a requirement, and if you are caught without them on, well you can be terminated. The same with hardhats... they could be worn any way you wanted, and weren't necessary if there wasn't anything that could fall on your head.. now, there is zero tolerance for not wearing them correctly... Makes me glad I'm and old fart and retired.
But for all you youngsters, make sure you keep safe, and protect your hearing.. or did I say Earring...
Charlie