[Harmless Teddy Bear]

The peace sign is satanic? Who knew.

Actually yes. It is an upside down broken cross.

Now, should it be protected speech as a religious symbol?

[Fzob]

Actually yes. It is an upside down broken cross.

It's not clear to me how that qualifies it as a satanic symbol. Is there a protocol for deciding these things? Is the plus sign a satanic symbol as well?

[dmz]

http://en.wikipedia.org/wiki/Peace_symbol

There's a good bit of info on the peace symbol at the url above. It does not at all agree with your assertion.