Ermm... there's about 5 people at least that wanted a claim off you.
J2S is mayor, not investigator. Maybe he was just trying to throw people off the scent not realizing it had already been revealed. Mayor is a day role and J2S has been mayor for a day which is long enough to know that Postage is scum. If J2S is wrong then lynch him because it means there's more to his role than has been revealed.
So him being mayor for a day tells him I'm scum. How do you come to that conclusion? Mayor role doesn't even have to do with finding out peoples roles. I don't know why people would blindly believe him.
Either way no way I'm going to be lynched with pretty much no actual proof at all with a "well if he's wrong then we'll just lynch J2S tomorrow" Fuck that.