All people are bad people.
That cannot be right; I will provide a counterexample: All humans who use reason have the ability to come to a conclusion about ethical behavior. They are thereby compelled to behave ethically, and thereby they are good in their actions. A person's actions at any time may be good, so it is false to say that a person could be eternally bad.
If it were true [that what is good is undecidable by the human mind and impossible for man generally] it would mean that human reason is utterly irrational in asking the ethical questions it cannot answer, while asserting emphatically that only reason can answer our ethical dilemmas.
All people have meaning and reason, and in particular a good and indubitable meaning (purpose). The first step in self-actualization is to recognize and obey the LAWS OF GOD, by understanding them you will be able to become an effective servant of GOD.
How can we tell? None of us live very long.
Life is short, but this is a fact about nature, not man's character per se.
Man carries the spirit of GOD, but man is also part of nature, so each one has a purpose for being here.At least not when compared with time that exists. If we were anywhere near perfect, we would live a lot longer.
How do you know that this time-space is the only awareness and the only life that will ever exist or has ever existed for you? Maybe you have already lived a thousand lives and in some of them you may have even lived a thousand years? Since you have the spirit of GOD within you, you are already eternal.
It follows immediately that our worldly existence, since it has in itself at most a very dubious meaning, can only be means to the end of another existence. The idea that everything in the world has a meaning [reason] is an exact analogue of the principle that everything has a cause, on which rests all of science.
Now tell me who is bad. Is it the person who wants to change his badness by going to God, the only way to change badness? Or is it the person who wants to remain in his badness by staying away from God, the Bible and church, and locking himself into his badness thereby?
You have not justified the opinion that all people are bad, so there is no reason for any individual to "know" that he is bad; it is simply not proven.