Normally, organizations accept anonymous donations from people because of modesty or privacy -- the donors don't want their name on the wall or in the press. They have a mechanism for that called "anonymous donations", but the mechanism isn't meant to guarantee that no reputational benefits at all can be gotten by the donor. In this case, several people knew he had donated to MIT and he invited professors to his dinn…
Meh. It's not OK, but it's not that bad either. Even if what Ito did was wrong, which at least with hindsight it clearly was, the guy is still a hero.
Even the allegations about him using his position to raise LP money for his fund is somewhat dubious, given that he's much more famous for being a venture capitalist than he is for running the media lab; it's literally why he was hired for that job in the first place. It was bad judgment, and maybe he deserved to get fired for it, but as scandals go it's fairly benign.