Morgoth and Doriath

[Raynor]

By the fact that Morgoth "sought most" to set Hurin against Thingol and Melian.

Please, the quote you are apparently referring to mentions that Morgoth distorted the facts concerning Thingol and Melian, not what you have stated.

Actually, though, it would seem more likely that one of the Valar would have enough foresight to know events would occur as they did, than that he would randomly send Hurin out and hope for the best (worst), but something in between seems more likely.

Again, the purpose of sending out Hurin to further his hatred between Men and Elves; a pretty general purpose. As far as foreseeing, it is based on knowledge of the music, of which Morgoth did not have much, as he was too busied at that time with his own distorted theme (even Sauron had more knowledge in that respect), and more less so in terms of the Eruhini.