Sure they can. Perhaps a useful example of something like this would be to consider cryptography. Crypto is ridiculously complex and difficult to do correctly. Most individual developers have no hope of producing good cryptographic code on the same scale and dependability of the big crypto libraries and organizations. At the same time these central libraries and organizations have bugs, mistakes and weaknesses that can and do cause big problems for people. None of that changes the fact that for most developers “rolling your own crypto” is a bad idea.