[Kuruharan]

then how does Hurin's suicide fit into all this?

Strictly speaking we don't know that Hurin committed suicide. It's presented as a rumor. The rumor is sparked because we don't know what happened to him.

Beren's quest had nothing to do with Feanor other than the jewels. Beren went after a Silmaril to give to Thingol in exchange for permission to marry Luthien.

I think that if the request besmirched Thingol, it probably tainted Beren too.

Hurin's actions contributed to the downfall of Gondolin. It says in the Sil. he did not trust Morgoth's release of him...Hurin should have stayed away from Gondolin, knowing Morgoth had an ulterior motive for releasing him.

Probably. However, by that logic Beren contributed to the fall of Doriath by bringing in the Silmaril which ultimately caused the downfall. All Hurin did was show Morgoth the very general location of Gondolin.

Beren did not pursue the Silmarils for their own sake. His intentions even in retaining it after the Battle of Sarn Asthad were noble.

As stated above, I'm not sure that's true. He was pursuing them to gain something for himself. However, he was not ensnared by the Doom of Mandos since that was for the Elves.

Aragorn dealt with challenges, moral, political, military, and personal that were not like Hurin's

Aye, indeed. And anyone in their right mind, if presented with a choice in the matter, would choose Aragorn's challenges over Hurin's.

I don't think that you are giving Morgoth the credit that he deserves. In the Third Age nothing was more dangerous than being brought alive before Sauron (something that Aragorn did not experience). How much more so for his master in the First. The terrifying presence of Morgoth was the worst experience that one could experience in the world. Hurin experienced it. Hurin endured.

I would submit that Elendil and others of the early Dunedain could be every bit the equal of their forefathers.

You'll likely be arguing with the Sub-creator if you do so, but feel free.

Even though Morgoth was far greater than Sauron, Hurin never put fear in Morgoth.

So wouldn't that make perfect sense. Smaller, weaker spirit afraid that a loose enemy leader may disrupt his war plans compared to Original Evil toying with helpless prisoner who can't do a thing unless allowed. I don’t think the two situations are comparable.