Does an oppressive regime + WoMD + a rogue state = a just war?

Let’s define a rogue state, if you will, as one that, given their track record, could possibly sell weapons to Al Queda. That seems to be the logic of the Bush Administration. That’s why we aren’t planning to overthrow the Robert Mugabwe regime in Zimbabwe (as he is actively starving the part of his population that opposes him politically). He has no WoMD. I posit that these 3 factors combined do make a war just. Thoughts?