They as in the other interested parties. Issue is far more complex than you present, with far more stake holders. And yes, I do in fact mean stake holders rather than share holders because there are a lot more of people invested in the issue than just shareholders. You have everyone from security apparatus that made deals with google to various companies that really like google's ad network and value it brings. All of these have vested interest in google staying in Europe.
Europe itself would not need to replace google at all. You seem to forget that much of google's development and multiple server centres, as well as overwhelming majority of google's money flow is in Europe. Even if google could shake off the former, latter is its main artery it needs for basic survival. That is why I consistently point out that you don't go into a direct conflict with large sovereign states as a corporation - that is not a fight you stand to win. Instead you subvert the government by buying influence through various channels available to you. In this case, google's problem is that there's a lot of other stake holders that while interested in google remaining in Europe aren't interested in it maintaining its current monopolist position.
You last point appears to be about you simply not wanting to look at the reality - that internet hasn't brought on a "global culture", if anything it did the exact opposite. It brought together the small fringe outlier groups together and created huge echo chambers where pundits peddle their opinions to their own circle which is mostly insulated from outside influence. And mind you, google is guilty of causing this more so than other companies because of the way its search personalization works. A good example of global warming issue - if you read a lot of articles and do searches on denialist side, google search will serve you mostly material it thinks you're interested in, that is denialist material in searches for facts. At the same time if you're on the other end of the spectrum, google search will produce facts that support your view on the very same searches that resulted in denialist material for the other person.