Google Talk shows in iMessage and I can't delete

Look in System Preferences -> Internet Accounts -> Google and disable Messages.

Firstly Apple isnt forcing you to use anything. Secondly you need to delete it from Internet Accounts if you dont want it appearing in the bottom left hand corner of your messages window. If you need Google for something else then you will have to leave it there and "hate Apple" for forcing you to uses something you want to use.