They did that once (as far as I know), on a more or less emergency situation under pressure from an important customer/partner(?).
If they were doing that, they could have earn millions lending money using their own "swap" system with little risk. Why then to accept customers to lend money? Why allow competition that ruins the interest rates? Why the effort to avoid rates higher than 1% a day, if they are lending? And if they made millions that way, why are we still talking to the founders? They surely would be rich enough to hire people.
They denied being lending money using their own system. I'm tempted to believe them, even if I asked the question and admitted that they might be lending now. I see no problem on them lending real Bitfinex money and their own personal profits. Even if I would rather see that money on bid orders on Bitfinex orderbook.
But if they are not lending, they don't have any reason to create fiat, specially for "friends". Buying bitcoins on fake fiat is too risky, it doesn't seem to be their type. It seems Gox ended bad also because of that.
Some very good questions you raise here. Only the top management of Bitfinex have all the answers, the rest of us can only speculate.
They are mostly rhetoric questions, because (right or wrong) I think I know the answer. They did all of that because they are not lending money (or not big amounts, responsible by the increase of swaps) and, clearly, not creating fake fiat to lend to anyone.
I saw Bitfinex more than once adopting measures that hurt its short-term interest in order to defend its long-term interest or matters of reputation/principle (for instance, a recent one, even if symbolic:
http://www.reddit.com/r/BitcoinMarkets/comments/28twpj/manipulating_bfx_swaps_for_fun_and_profit_a_howto/ciehls0 , you have to read the previous post).
A greedy or dishonest exchange wouldn't let customers to lend money and would control the supply of the money to lend it self at high interest rates. They decided that this policy would hurt the long-term interests, even if it could be very profitable on the short-term.
Several times Bitfinex reveled a clear concern with the excessive rates of interest. Again, they were putting the long-term interest ahead of the short-term, since they get more fees if the rates are high.
Dishonest persons don't think long-term, because they have no long-term plans for their business. So, I think they are an honest exchange.
That doesn't mean I like every thing about them, including (but not only) the current volume of swaps. Or that sometimes I don't hear a small voice saying "Fool, you are going to lose all your money on Bitfinex. Fool!".