Shamus, I think you are being deliberatly obtuse on the issue.
The issue is that DLC has been getting out of control, with companies releasing things like alternate character skins and costumes as additional paid-for DLC. Things that should already be in the game, especially if the content is availible on day #1. The only reason why these additions are NOT part of the game, is because the company figures it can make more money by selling them as a DLC.
Ask yourself if DLC didn't exist, would Valve, Capcom, or other companies doing things like this have tried to ship out and sell this content as a seperate disk based add on? No, they wouldn't have. It would have just been in the game, as alternative costumes usually were.
The point is that people who are upset over this don't like being gouged, and the game industry looking for literally every angle they can to make a buck off of people. Increasingly, anything that can be held back from a game and sold seperatly will be.
You might not have an issue with this, scream about entitled-feeling morons, and everything else, but that doesn't change that a lot of people don't like it, and want their games to be self-contained, with only meaningful add ons and expansions being released for additonal payment.
While I can't speak for you, I'll also point out that a lot of the defenses of what Valve is doing is because it's Valve. You'll notice not many people have come running to Capcom's defense over what is pretty much the same exact issue, with them selling recolors and alternate costumes for characters in games like "Street Fighter".
It's fine to respecfully disagree with people, but to mock, misrepresent, and call them idiots? I'm sorry I can't really get behind that. What's more, think about how this is going to make you look if you at some point decide "okay, well DLC is going to far here" and people can point a finger at your passionate defense of Valve and ask "well, what makes it less ridiculous for Valve to do, as opposed to this other company?".
Now, I know people will probably get on my case yet again for saying this, but really I don't think Valve was effectively "Metabombed" for this, since trolls aren't that powerful on their own. While some people might be unpleasant in the way they express their dislike of trivial DLC, simply it's very existance being annoying to them, I don't think that is a reason to totally dismiss their position.
To be honest, I think DLC and microtransactions are out of control, I have for a very long time. I have no idea on how one would go about articulating a law to regulate it, but even as someone who doesn't want the goverment involved in business any more than absolutly nessicary, I really think digital transactions need to have more standards applied to them, especially when connected to other products. 10-15 years ago when digital downloads were just a whisper on the wind, people would have thought what we are seeing now is the height of ridiculous, paranoid technophobia, after all the gaming industry would "never be that greedy". Leave the door open too long, and I can almost guarantee eventually we'll see people angling to not only put games online and supported by microtransactions, but have people pay by the minute or hour like the days of things like Q-Link. It will be worked in gradually if it goes there (or I should say returns there) but guaranteed, unless someone slams on the brakes things are just going to get worse. What seems insane today, is oftentimes the sad reality of tomorrow when it comes to money making schemes. Heck, people will say "pay by the hour" is dead, but at the same time they thought the same thing about interactive movies, and look at Heavy Rain, their return is heralded as some kind of new and revolutionary thing.