Except you completely miss the point of that scene at all. It wasn't to portray Superman as less heroic. And it wasn't to show Superman as guilt driven either like Drz is saying.
They specifically portrayed that woman as someone who took Superman for granted and had no right to be angry at him, especially since her husband died from cancer, something that Superman has no control over. The comic even specifically had characters saying that the woman was a nutjob.
The fact is that a lot of people see Superman as a God. And just like how people get angry at God for not being able to stop things that are out of His control such as well.....cancer, this woman was the same. But directed her anger towards Superman.
Now why was Superman upset? Not because he was guilt ridden. He might feel some guilt over New Krypton being destroyed and being away from Earth for a year, but he'd be an idiot if he felt guilty over the death of this woman's husband. He's upset because he cares. He cares for everyone.....like Jesus
. The fact that Superman actually cares for this crazy woman's loss, even though he doesn't have to, makes him more heroic.
And it's this kind of thing that makes Superman want to be grounded because with Superman up in the air, he's looking down at them and the people are looking up. Just like the relationship between God and man. Superman being on the ground symbolizes people connecting with the man within Superman and Superman reconnecting with the people after being away for a year.