On the topic of the leak vs. the substance of the draft opinion (so here I go falling into the trap of letting the right-wing Repubs set the terms of the argument, which is a no-no)....I actually suspect it was a conservative, not a staff or clerk of one of the liberal judge's, that leaked it.
This is great for them. Get the opinion out there early in all its ugly vehemence and soften the ground for when the real opinion comes out at the end of June, when further editing will have buffed out some of the hardest edges (e.g., let's see if Alito does not take out the term "abortionists"). And then the conservatives will be able to say, "look how good you have it! It could have been so much worse. Ah, you see? All is well!" And you know what? All *will* be well for most voting Americans. They will be happy that there was what looks to them like "compromise" (but is really mostly a change of tone), they will be generally unhappy with abortion being outlawed in most of the land, but with the general sense of compromise around it they will think it will probably work out, and then when voting comes around, they are going to vote with inflation and war at the top of their minds and will not be moved overmuch by this issue.
I think conservatives know that it's terribly unpopular to make abortion illegal in most of the land and that this opinion would do that, but they are going to do it anyway and this is the best way to make sure the furor dies down before elections. Win-win for them. They can focus on the leak and between that and the 24 hour news cycle most people will have forgotten about it and will feel better, instead of terrible, in June when the final opinion comes out.