Your assertion implies that a parable can tell a falsehood to convey the truth. Illogical, and also contrary to the principle of the inerrancy of the word. The Bible contains no fanciful theater; it uses one truth to convey another.
[Matthew 13:10-11] And the disciples came, and said unto him, Why speakest thou unto them in parables? He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given.
You may take that implication, but I didn't suggest it. Your (or mine) failure to interpret the parable correctly doesn't make it a lie. The parable ran deep and wasn't a statement about the fate of sinners versus the righteous as you seem to suggest. Christ never called the rich man a sinner or the poor man righteous. In fact, if you believe that then you would have to believe that the poor man got to heaven without faith in Christ.
There are in fact many theories about what it represents. Your interpretation is at odds with scripture after scripture telling us that sinners die and that eternal life is only possible through Christ.