Some people like to complain or some don't. If you complain something, it may helps to improve which is also better for other. Some people trying to adjust instead of complaining
On earth nobody is perfect, Every human do mistakes in his life. Some people learn from it or some of them don't.
People of our world are very lazy. They dont want to do any effort. They just want results. If every human in world complain when anything going wrong that may helps to improve our world