I think the main issue is that there are straw man arguments made by both sides. Stats people fall into the trap of thinking that people who criticizes FIP must also believe that ERA is better than FIP. It's not true. FIP is clearly a better stat than ERA IN GENERAL. But it's not an absolute - if a pitcher under-performs his FIP, was the pitcher just unlucky, or are there other factors at play? I remember when Morrow was having some awful seasons with the Jays, people started to dig into the numbers and found that with runners on base, Morrow's ERA skyrocketed, and so thoughts were formed about his inability to pitch effectively from the stretch, a factor accounted for by ERA but not by FIP, as after giving up 5 runs, Morrow would go on to strike out 6 and walk none over the next 3 innings before imploding again.
There is an interesting article here (http://www.beyondtheboxscore.com/2012/4/16/2933862/a-closer-look-at-pitchers-who-consistently-underperform-their) from 2012 about pitchers underperforming their FIP. It comes to a minor conclusion that perhaps pitchers do have SOME influence over their batted ball profiles, citing Johan Santana, who outperformed his FIP by 20 points over more than 2000 innings.
ERA isn't a better stat than FIP, but FIP isn't bulletproof. There are always exceptions - pitchers outperform and underperform their fip, but if all of these pitchers' innings are taken in the aggregate and averaged over many years, this nuance is lost.
Finally, I understand why advanced stats are defended so dearly, as they have been under attack since their inception. But that doesn't mean that SABRmetricians can rest on their laurels. There is more work to be done. Instead of defending FIP to the death, maybe try and understand WHY pitchers like Hutch have so badly underperformed. There could be a reason (luck may or may not be it), and if elucidated, it may help him pitch to his ability. In essence, FIP is a great gauge of ability (much better than ERA), which is why it predicts ERA better than ERA does, and why it is so frustrating to see Hutch struggle. But just because we have found a piece of the truth, it doesn't mean we have found the whole truth.