Carpet beetles and clothes moths aim for our woollen fabrics and furnishings. They're just doing what comes naturally. They were born to recycle the fur, feathers and even skins of dead animals. Have you ever tried to eat wool? The reality is you can't, simply because wool is made of keratin, a large and long molecule that is hard to break down. There are very few animals that can actually digest and break down keratin, and carpet beetles and clothes moth caterpillars are some of those specialists.
So, when those insects fly into your living room and spy the carpet on the floor, their natural reaction is, "Don't worry about a thing! I'll clean all that dead sheep wool up in no time!"
After all, they've been doing that sort of thing now for many millions of years.