Paying attention to what? Actual prosecution of actual wrongdoing? If anything, the rule of law is being supported in this endeavor.
Why should Mueller NOT try to find evidence of criminal wrongdoing by DJT? If he committed crimes, he should be prosecuted. If he didn't, he shouldn't. Just like Clinton. The husband. Well, that might not narrow it down much, either, but you get the idea.
Is a witch hunt a bad thing if actual witches are found?
Tell you what, there's some speculation that some of the institutions involved with Manafort are also connected to Clinton. The whole thing, as noted often, is incestuous. So, this isn't necessarily a partisan thing at all.
I want the rule of law followed, and I want it followed fairly. The question isn't why investigate at all. Of course I want it investigated. The question is why weren't there investigations then into all the Obama/Clinton scandals? The answer to that seems to be, the fix was in before it started. And, given that there weren't investigations then, the question also is, for what purpose have they decided to investigate now?
By all means, do investigate now. But I don't want witch hunts. If the purpose of this investigation is to find out, since there have been allegations against Trump, if there was any wrongdoing on his part. If the purpose is to oust a president they don't like, THAT's not rule of law. That's selective application laws the investigators find expedient.