It’s depriving journals from money they could make from publications when they have already charged the authors to publish them.

There is no moral dilemma here : accessing an article thru Sci-Hub deprives nobody from getting its due money. Scientists unfortunately continues not being paid for the paper, journals continues being paid by universities to review the paper, but nobody wants to pay just to read a paper from the journal when it already has been paid for.

It's not depriving authors or the reviewers of money, since they don't get any money anyway from publishers or readers. It is depriving publishers of money by replacing them, doing the same thing they do (intermediary between author+reviewer and reader) better and cheaper i.e. for free - but that's essentially just outcompeting them in their own business. Copyright is there to protect incentives for authors, but it should not grant an artificial monopoly to useless middlemen.

For these publishers, that's a welcome side effect. Having a small number of private companies control access to what should be communal resources, solely to enrich themselves and their shareholders, is not how this should work at all.

Also, many users of Sci-Hub would not be able to afford the publishers' access fees anyway. The alternative, if Sci-Hub is destroyed, isn't the publishers getting loads more cash rolling in, it's such users not being able to access these research papers at all.