I wasn't being philosophical, I was being literal. Doctor Manhattan has feelings, because there is evidence of such. When you continue to say that he is emotionless, just because of the course of action he may or may not have chosen, it shows a lack of understanding of the character. Just because a man watches a woman drown when he could have saved her, it doesn't mean the man won't go home and cry in the dark about it. Feelings/emotions and actions are very different, despite their interconnectedness.
He never really longed to stay human. Actually, he was growing away from humanity, and it was his emotions that kept him grounded, otherwise he would never have chosen any course of action at all. His reactions alone are the purest form of evidence that he retained the ability to feel emotion.
Also, to say that he let things happen that anyone else would have stopped is somewhat redundant. If anyone else were in his place, they would almost certainly choose identical paths. It's about perspective in this case. You can't possibly know what it's like until you don the black banana hammock yourself and experience everything he has. And at that point, you're virtually the same person, liable to make the same decisions, in a world where everything is predetermined (as stated by Manhattan himself).
I never intended to say that you are philosophical in your statement, I only intended to say that the implications are so.
As for the opinions, I readily stated that we have ventured into a well of discussion, one that has no outcome. Based on opinion, it will go this way and that.
I will try my best to put all in a capsule (from my side). See, Juggernaut, felt Black Tom's ailment, so much so that, out of element, he had some form of empathy that affected his 'handi work'. Ex; Not feeling the same rage toward Spiderman, even from his past embarrassment, and allowing him to take a few shots here and there: bottom line, avoiding confrontation with only the agenda to help Tom on his mind. That is feelings made incarnate. That is how comics describe them. That is in my opinion, the purpose of comics, to 'display it all for us' the character's tendencies, and emotions, and then translating them into actions for us to see. If there is an action that was even off panel, it is described, pictorially, or by reference so that we are all on the same page. Anything other than that, is only supposition, or derivation of self. Manhattan's actions simply state (to me and to no doubt an open audience), that he puts his feelings and emotions into the backdrop, and lets his deductions, reasoning and longing for balance do the work. That is why he let Silk Spectre go. That is why he let those things happen.
I was only intending to put forth comic history. Let us take Batman for ex: If Batman had the power of a Lantern, do you really believe he would let people die there? Would Wolverine, or Cyclops, or even the one they call as cold as they come, Mr. Fantastic? My answer, keeping in view comic history, and not venturing into any open grounds of thought will be: Yes. They will defy the fates, and they will defy the fore tellings to save as many as they could there. Would they let a culprit walk away? Never. If your answer to any of these is yes, or even if you say that we can't know, then you are truly associating an open philosophical ground into the answer. Pure comic logic, character history and tendency state that they will each act out of heart, not merely out of reason, with a few variations, give and take. Manhattan won't. If he sees a child being crushed under a trailer, just because he sees a near future where she is involved in a crisis, he will (most likely) let it happen. Now, if he feels guilt right there, and I have openly said he does feel it, and if there is an extra iota of grief that is off panel, then it is non circumstantial. What is a factor is, what he has been known to do in a similar situation. It is a no brainer bro, he will let it slide, as long as the balance, or his derivation or reason is met. Hell, he was even 'non-feeling and totally reckless in respecting Silk Spectre's feelings, when he thought pleasure should be derived to a maximum! Who does that bro?! Only someone who does not feel, by extension. Lets say he feels, (and I think I am running a boring loop here) but it might as well not be there, since what he acts on is not what he felt, but what he did per his reasoning.
I am sorry, I think I can't convince anyone of it, if they were not in the first place. I tried though. I still think this is pure opinion, although I am trying to quote as close as possible from the source material, and not my own head n; heart. It's what Manhattan would do eh?