What cause the distributer to go bad?

What is your question?

I have replaced one catalytic converter and still failed Ca. smog. The second is being replaced but in the meantime my distributer went out due to some sloppiness in a ????? I was told that it will continue to ruin distributers until I have it repaired to the tune of $3,000. I was in shock and did not ask enough questions. Can this be explained? I am already spending $3,500 on the converters.