Next time Republicans have control of the Senate and need to nominate a new member to the Supreme Court, they ought to just consult with Dimocrats, and nominate whoever they want, since they can't seem to vet the nominee properly anyway.
Naw, the real problem you guys have is that most of these judges realize that American Law has a liberal bent, and you can only bend it back so far.
This is why Stevens, O'Connor, Kennedy, Souter and now Roberts (and maybe Gorsuch) are only willing to go so far in trying to turn back the clock on issues.
The point is, turning back DACA is impractical, and they know it. As it stands now, they can only process 400,000 immigrants for return a year. We don't have the court capacity or jail capacity to do more, and Trump divisive rhetoric has made blue states even less likely to cooperate with such efforts.
So the last people you want to waste limited resources on are the most sympathetic people.
Roberts is saving the GOP from Trump, or trying to. They know that the GOP is going to need a post-Trump future after he is hopefully gone in November.