As the OP, I can assure everybody that I am not in the least "upset" by the appearance of the "no-nukes" symbol.

I do query the appropriateness of such a political statement on Google, just as I would query the appropriateness of such a statement on the home page of AOL or YouTube.

A dove carrying an olive branch flying in tandem with the space shuttle would not have been beyond the creative talents of the Google artists, surely ?