Implementation is not the same as specification. Bugs happen, and they are never specified. Chain splits are a risk and have happened in the past. When it happens either there is a hardfork into two coins, or one of the two chains is abandoned. Neither is a positive outcome, and bitcoin will be (seen as) damaged either way.

Bitcoin is open source, and open source is decentralized. If you are not happy with Bitcoin Core feel free to fork the code or start your own implementation.