Because in this case, the "mopar family" seems to have more sense than the cops there. If the cops there weren't too busy at the doughnut stop, they would have seized stolen property immediately before someone had a chance to strip it.
What he's referring to, Rani, is someone "on the other page" sounded like they were scolding the Whites (owners) "for not doing more." Hell, they should not have to be doing ANYTHING. The PD should be over there beating Sitton against his expensive front gate and pouring pepper spray down his throat, "where's the parts?"
We don't even know if Sittin really DID "buy" this car. For all we know, he could have hired some of his drug friends to go over there and steal it directly. The fact is, "we" don't know anything, except that it seems that this guy has a car that does not belong to him, and no title.