Rockstar USED to support the modding community. Back when it was DMA, they actually gave out their toolset for free for people to edit cars/maps/handling/etc for GTA1. Same for GTA2. GTA3 series (GTA3, GTA Vice City, GTA San Andreas) all used the same internal format.. which Rockstar released to the modders who happily built their own tools. That's why there's so much stuff done for them.
Then Hot Coffee broke. Rockstar, rather than admitting they had left the content in the game, fully runnable, and only blocked by a single 'censor bit' (literally, you changed a bit in the script and it would run the mini-game) threw the modders under the bus and claimed they added it. Afterwards, they specifically tried to make sure modders couldn't work with the game. Changed their formats (sort of, it was similar enough people caught it), refused to allow changing of the archive files (people came up with a loader that bypassed that protection), constantly updated with "performance fixes" that did nothing but block the modding bypasses that let people load modified files, and so on.
They've mostly come to quiet down and sort of conceded defeat, but only in part. Expect GTA5 to be impossible to mod at first before people come up with asm loaders or the like to do more code injection and bypass the locks. (Oh, and LA Noire? Different company than the GTA series, just under Rockstar name. I don't know how much even relates between the two. A better comparison would be Red Dead Redemption, were it out for PC)
Bioware used to be good.. they had the toolset for Neverwinter Nights because the game was MADE for it. It had a bare-bones singleplayer story, but the real draw was multiplayer so GMs could make modules, and have gaming nights using their engine to handle the nasty grunt-work and so on. Naturally, it's a massive community even now a decade later. Dragon Age 1 also had a fully fledged toolset, showing they didn't forget their roots.
Key thing to remember is most of DA1's development was done before the EA buyout. AFTER that buyout? Dragon Age 2 is in theory moddable but they changed formats, never updated the toolset, and people are picking through it with less luck. Nothing for the Mass Effect games (but they're primarily console based so forget them). Any Dragon Age 3 will most likely never have tools either. The Bioware of Baldur's Gate era (which by the wayt is still one of the most moddable games, with some former developers making mods for it too! All fan-engineered tools!) is long long gone.
And then Bethesda, who is the one company that loves their modders and understands the draw they have.. even as they try to shaft them by insisting only the consoles are the platforms worth anything, then releasing crappy console ports (seriously, there's no excuse for Skyrim's default UI on a pc). On the other hand, releasing tools and encouraing a modding community by never rewriting their internal engine (they change the graphics engine, but the internals have code back from morrowind days, meaning learning to use the toolset for Skyrim is a lot like Oblivion, or even Fallout 3) means that they can have said modding community FIX their mistakes. Ironic in a way.
So long story short, Volition not outright supporting us is nothing new. On the other hand, theyt're far nicer than some companies. Their stance seems 'live and let live' in regards to this. There's been cases where stuff modded has caused them problems, so they've asked politely and it's been fixed (uploading characters for instance). Other companies would just ban and pull out the litigation-minigun to saturate-lawsuit the modding community. Considering the fine line legally modding has, that's as close as you'll get to being officially approved without a full toolset/format release for us.
Although I do wish they'd give us at least a bit of the internals of some files, notably the compressed binaries of say car configs and customization, or the full model info.. even a little leak under the table. Problem is any person there who leaked that to us would be looking for a new job and probably face being sued under breaking their NDA, so it won't likely happen.