Perhaps rather than love my feelings would be mingled respect and pity. Respect for who he was, and for what he was capable of; Pity because of his doom. I don't think people give enough thought to the odds against him: singled out for destruction by the mightiest Being in Arda- no wonder he fell, it would have been unbelievable if he hadn't. Were his actions wrong? Yes, of course, and his fate is just. I think more attention should be directed at the causes, and less at the result (which has more than enough already): We know that problems can occur in families when one of the parents dies and the other remarries, how much more so among a
race that rarely dies. I have no proof, but I believe
Finwe's remarriage was the first time that had happened (atleast in
Aman). No one would have understood the effects that could have in Finwe's son. As the book points out this is the root cause of
Feanor long path downward. Now, once this enmity has been kindled in the heart of Feanor it lies largely dormant until stirred up by the cunning of
Morgoth. Soon after it rears its head in his first unlawfull act: threatening his half-brother. The consequence in essence fulfills the imagined cause behind it, namely,
Fingolfin ruled the
Noldor. Following on this is a request for him to give up his greatest treasure (
the Silmarils), it must have seemed to Feanor that he was being stripped of everything. Then comes the news that his father has been killed: I find the account of Feanor's grief for his father to be the most touching scene in the whole work. In his grief he imagines all the lies of Morgoth to be true.
In essence, Feanor was a troubled young man (by Elven standards of age), and he became a troubled adult. That doesn't excuse his actions, but I think it makes them more human.