Childish indeed, for a grown man to A)have a flipping bird picture as his profile picture and B)writing a whining blog post when it gets removed..
They are free to do this, and rightly so. But people should be aware that this happens, and is a bad thing, so when a viable alternative is created, that doesn't suffer the same problem, they already know why they should move.
There is no "outrage". Nobody is being unreasonable by discussing this issue. Discussing this issue takes nothing away from the SOPA issue.