Everyone has something to complain of and has a right to grumble, because nothing is perfect... yet. We tend to accept a level of convenience and inconvenience as a standard we just take for granted, whatever level it is, and so are irritated at that which could be better and isn't being made so, or is presently ok and someone or some group with power/influence is making worse. Things won't improve if you stop complaining, they'll just deteriorate; so rejoice in your ability to complain, and practice it regularly.