Soliek is correct.
There are many, many reasons why people go off the derech.
But, I would have to say that the one overall reason relates to this…
People want to be happy, and when they see people who are ON the derech (usually this refers to parents or others in an influential role in their life) that, at least to them, do NOT seem to be happy, they feel ‘why would I want to live like that?’.
The line ???? ????? ????? ????? is not just a cute phrase, it is an important yesod.