I implore folks to always pack them (via dragondropping into the archive window) even though they're not necessary as others can learn by studying the source code. This came up during the beta and some were afraid people would only pack the PEX files while, for previous Beth games, the source was encapsuled in the SCRIs and helped the community enormously as working examples were readily available. It's nice to wonder, 'how are they doing that?', and be able to dissect a specimen to see what it's made of.That does work, just to confirm.
The problem is, especially in gaming comunities, nerds (Not used in a derogatory fashion. Lets face it, everyone here enjoys donning their wizard hat and robe and casting spells in a virtual world, and there is nothing wrong with that.) tend to get this "elitist" complex where they think they are better than other people and want to keep it that way by preventing others from using their ideas. Yea, sometimes you get jerks that rip off your code, but who cares? If you are really good at modding, you will come up with creative and well functioning mods that have a level of originality that anyone ripping off your scripts will never reach, because if they have to rip off your code, then they aren't as creative as you are.
So the idea here is that by releasing your sources, you are helping the community as a whole and going miles further than just releasing a mod that a couple of kids will download and post on your page how much they like your mod. By including your source files, you are sharing what you learned with everyone else, and thus improving the mod community as a whole to a much greater extent.
And lets face it. You don't stand to lose anything if someone does steal all your scripts and say "look what I made." You aren't losing money, you aren't losing e-fame because anyone stealing a script will still not be able to compete with your mod, if other people can improve on your scripts and modify them to be better then they deserve to be able to do that anyways, and you probably aren't going to make a mod that is going to get you that dream job in video game development unless you can do MUCH more than just write useful scripts anyways.