Goes with the territory. If convenient for me I bring it inside (like tossing it in my grocery cart) and when not convenient I just lock it to my bike outside (like going to get a yearly physical exam or jury duty). I replace my helmet when the inner pads wear out, which is about once every 18 months if I am riding a lot.

Just part of doing the business of life. Dental exam, eye exam, replace helmet, lube chain, air in tires, etc.