I just don't see how the "Orphan adoption" cover story helps the Trumpsters in any way.

Once it was known the meeting took place, Donny had to say something about why it did. He pretended that the only thing Russian lawyer was proposing was that Russia lift the ban on adoption in return for lifting sanctions - if Trump won. A campaign meeting a Russian, even one who officially represents their government, just to hear that would not be illegal (though Kushner should have listed the meeting orginally, which he hadn't). The illegal bit, which Donny didn't admit to at first, was that Russian government officials had dangled "dirt on Hillary" in front of him, he'd responded "oooh, gimme, gimme!", and that was soliciting illegal foreign interference in the election.

because their brainwashed supporters go along with Trump's stated goal for better relations with Russia as being good for Americans and Russians.