Show me some proof that the charges were dropped. I alrady showed some indicating that he was let off with a caution in return for pleading guilty.
Pete freely admits that he was googling kiddie porn. Whether you accept his explaination is up to you. The point is he's guilty and he admits as much.
The fact that you're having such a great day is further proof that ignorance is bliss I guess...
http://www.petetownshend.co.uk/diary/display.cfm?id=419&zone=diary
It may be a while before we know all the details but until then Pete's word is good enough for me.