Based on what I've seen in other cases, it seems to me like those fees are broken out so that a finger can be pointed at someone else and used for leverage. In other words, "Don't like that cost? It's all the FCC's fault", or something like that.
FWIW, the finger needs pointing. There was an issue with Viacom vs Dish a couple of years ago where Dish stopped carrying CBS. Huge screams in the media and from customers, finger pointing by both sides, but in the end it comes down to this:
In the past, the FCC mandated that cable and satellite companies carry broadcast stations in the local markets (not too big a problem on the cable side, but a big PITA on the satellite side). The deal was mandated carriage vs no license fees, and it was (in general) a fair one. Fast forward and the networks decided that since they were now entrenched, it was time to get paid by the evil cable/satellite companies "free riding" on their content.
The fact that it's a hidden fee is bullshit (the total should match the advertised rate + tax) but the fee definitely needs to be broken out separately, because charging to rebroadcast an advertising supported network in the very area they're giving the signal away for free is also complete bullshit.