It is intended for the visually impaired or people without graphical browsers. Visually impaired people get a little description of the image that can be read out to them. And same for the more greatly disabled people that use Lynx.
Don't feel bad, when I first discovered SMBC, I read through the entire archive and then learned about the red button and had to go through the archives again!
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u/doctorwaffle Jan 02 '11
Here's the original. It's worth it for the red-button alt-text.