all are equal, all are good, no one is intentionally bad

All humans are equal, a person do things according to the mind ( nature of mind) and a person mind is based on the body  ( good body, good mind) and even the mind itself (if some damage). A person might do bad because he is natural due to his mind.People don’t do bad things intentionally, people do because they have natural tendency due to brain and the person get the body and brain naturally, so it is not his fault. If his brain be brought to balance, he can be very good person. If there is remedy (when medical can understand human behavior and its precise causes and bring solution) , it should be done, and the last resort should be according to law he may face consequences for the overall good to win.

do things according to the convenience

Do things according to the convenience.  That is the secret of success. Many people leave doing things or get bored doing things that needs to be done is because they are too stiff on how thing should be done and so if they are not up to the exception, they end up leaving and they don’t enjoy it. So if you are that kind of people, let the things be done the way convenient and not the perfect way or your expectation. Be happy with however is being done. Doing is more important. Being so stiff will kill the happiness.