The problem with your example is that Berry actually accepted the illegal inducements, the Trump's did not.
Speaking of Iran, do we need to now indict John Kerry for going over there as a private citizen and negotiating things with them that he had no right to do? Sounds like that is what you are proposing, since he DID "take a meeting" with an enemy of the US.
No problem with my example. You don't take the meeting. And if you take it under false pretenses you notify people the Russians are trying to influence our elections. If he took the meeting out of a rookie mistake, yeah I am ok with it if it was reported to the FBI and dad says in summer of 2016, my son made a rookie mistake out of exuberance. No, they lied and tried to cover it up.
Second, with Kerry, probably at best ill-advised. But he served as a secretary of state and had dealings and I would hope his meetings were to help the US and not his own personal interest. (what US interests did Trumps meeting serve) However, if Bill Barr who was the AG looked into his dealings and felt they were in violation I certainly would have no problem.
And there are two really stark differences. One, Iran while an adversary, we didn't spend billions in a cold war. Small difference but a difference.
Two, Kerry while maybe illegal, did so because he had experience in that realm and doesn't appear to have individual motives in there.
Three, here is a following portion of a Donald Trump email written in June of 2016
....
President Donald Trump's son told a person promising him damaging information about Hillary Clinton: "If it's what you say I love it."
Donald Trump Jr. posted his emails with publicist Rob Goldstone on Twitter Tuesday. The emails with Goldstone show that Trump Jr. was told that the Russian government had information that could "incriminate" Clinton and her dealings with Russia.
Trump Jr. says in a statement that he released the exchanges "in order to be totally transparent."
The Trump Organization confirmed the authenticity of the posts."
So if you would like to have Barr look into Kerry's wrong doings, and if he becomes president and want to impeach him, sure.
So while there was no "collusion" or maybe even proven "coordinated activity", there was activity and information Don Junior wanted released. So we can't really say he didn't "meet with a hooker, do blow" and not get caught with his pants down....just like Berry. But they were both set up.