IMO some people here make mountains out of molehills.
I see it this way:
Coming to Redcliffe the first time, I notice by the "!" over their heads who has something to say, among others the old elf. I listen to his story and agree, like any politician / diplomat would with "I will look into this asap".
In that moment I don't have the intention to complete the quest. I just didn't want to frustrate an old man.
Later, when I open up my camp down south-west, I see the grave a few steps away. The way to my next goal leads virtually over it.
Now, why shouldn't I put the flower down? Do I run back to Redcliffe immediately "to turn the quest in"? Nope. Some day in a near future
I will be there anyway and can tell the guy, what I did.
This way I did a favour to a man who was hit by severe strokes of fate and it cost me... nothing at all, whereas he will spread the word in my favour.
Of course I must admit that there are too many silly quests and wished for some special answers.
One example:
Also in Redcliffe, someone asks me to find his "special" ram, Lord Woolesley, simply because it's too dangerous for him.
Now I'd like to have a reply like
"If you have the guts to ask me to hunt down your ram, then you're either totally crazy or a talented salesman of the sort who is kicked out by the front door and returns through the back-door. We might have a use for you..."