What is the word or phrase for trying to convince someone to join you in a bad decision?

The scenario I'm trying to find an idiom or expression for goes like this:

My friend comes over and wants me to join him at a multi-level marketing seminar which he has already joined. He seems to know it wasn't the wisest choice, but is very determined to get me to join him in this bad decision, as if getting someone else to make this bad decision will make him feel less foolish for making it himself.

Lead somebody down/up the garden path :

• to deceive someone. Our country has been led down the garden path by the politicians in office.

Misery loves company:

• something that you say which means that people who are feeling sad usually want the people they are with to also feel sad. On a bad day, she isn't satisfied till the entire family is in tears. Misery loves company.

(The Free Dictionary)