The U.S. Ambassador to the OAS has criticized Mel Zelaya for returning to Honduras before an agreement was reached:
"The return of Zelaya absent an agreement is irresponsible and foolish ... He should cease and desist from making wild allegations and from acting as though he were starring in an old movie," Anselm said.
On the latter part, well, it doesn't help anyone to start talking about how Israeli mercenaries are trying to torture you. Even the Brazilian government told him to stop with that.
But here's the deal. Given the stalemate, odds were high that no agreement would have been reached before the November elections. The economy was/is hurting, but the coup government very clearly believed it could wait it out. The idea that negotiations would even occur seems absurd, since Micheletti said constantly that he would not negotiate. He gambled--reasonably--that when push came to shove the international community would eventually recognize the new government and go about its business. Panama had already indicated it would go that route.
There are, of course, many high-level private discussions going on, so maybe there are facts we don't know about. However, I wouldn't mind hearing an argument for how a negotiation could have successfully proceeded.
So you can call his return a lot of things, but foolish isn't one of them. Not if his goal is to return to the presidency. It was most definitely risky, but it is highlighting the illegitimacy of the coup government. That Micheletti is responding with such rampant disregard for the constitution or human life is tragic.
At least the U.S. did call the suspension of the constitution "deplorable" but I have yet to see whether the administration goes beyond that.