That you do, little sock puppet. That you do. Thanks for apologizing for your sock puppetry: I think it means a lot to everyone here. Too bad you couldn't just stop there, though. You had to remember all of those nasty, self-justifying lines about why it's totally cool for you to be an asshole to everyone who'd appreciate some security about their futures at this point. Underpinning your argument is this notion that it's fine for you to be indifferent to other people because you don't owe them a reply before April 15. No, you don't. But if morality stopped strictly and abruptly at what we owe to other people in the legal sense of owe, the world would be a fairly miserable place. Notifying a school once you know that you won't accept an offer is just one of those little things we all do to make it easier for our friends and colleagues to live in this world, in hopes that someone will do us a similar good turn when it's our time.
This is the problem with Marxists: no concept of moral discretion, no sense of the benefits of exceeding the ethical requirements. Everything has to be cast in terms of strictest duty and inflexible political maxim, and your responsibility stops there. It's so...trite. And boring. Kind of like very obvious sock puppetry.
Shoo fly.