Hello Eagle42 How are you? Thanks for the very good question. The answer is "because of become popular or famous only human are ruined by themselves.
I will show you two example of this.
Diego Armando Maradona. One of the legend of football world. The winning captain of Argentina on 1986 world cup. The legendary magician of hand of god. He was so famous that he didn't think of looking back ever. But what he had done? Abused his life with drug. Ruined his fame and love from millions of fans.
Nasir Hossein and Sabbir Rahman. Two promising and rising cricket players in Bangladesh. Huge popularity and money made then blind. Now both of them are accused with scandals of many female company. They have broken team rules and regulations. Now both of them are past for Bangladesh cricket team.
One more to say. In our country when anything comes new in market the producing company keep the quality 100% to get the popularity. But when the product become popular then then ruin the quality. May be it happens in most of the countries in the world.
These are the practical example for you. Human are fame collector and they are the one who ruin everything.
Thanks for reading.