Depending on the tone, this is either a mischievous or menacing
reworking of the cliche -
"if you can't beat 'em, join 'em" - which suggests that futile
opposition is not always the best course of action.
Conversely, the reworked idiom suggests that "have nots" may, or
should, harm or disenfranchise those who exclude them from their
class or group.