Is it permissible to divorce a wife without cause due to an inability to be just among wives, and is this considered an injustice that warrants punishment?

A husband must be just between his wives in terms of division [of time and resources]. If one of them forfeits her right, then there is no blame upon him. Divorce without need is disliked or forbidden according to some scholars, because it is harmful and destroys benefit. The husband is advised to strive for justice between his two wives and to treat them with kindness. If he is unable to be just in the division, he can give the second wife a choice between divorce or waiving some of her right in the division. If she agrees, there is no sin. If she refuses, then divorcing her is permissible due to need.