Could NOT engaging in jury nullification be hypocritical?

[Redalgo]

If you are on a jury, your responsibility is to decided whether or not the defendent broke the law, not whether or not you agree with the law.

On paper, yes, but in reality each juror decides for his or herself what should be their responsibilities. As for the OP, I think convicting somebody of a crime one is otherwise alright with in their personal life would be hypocritical and reflect poorly on the character of the juror.