I have always been slightly torn on this subject. google moved into my niche in 2012 and google has made significant efforts to keep their visitors from finding us ever since. google's actions have cost us millions. That's what they are supposed to do, they are our competition, they are not supposed to help us.
Who is harmed? google's competition is harmed. It's could be said that google's users are harmed. google's customers are likely harmed.
Competition: that's just business.
Users: two problems here, first it is rare that the user (searcher) notices they are harmed (if a tree falls in the woods and no one is there to hear it), second, what duty/obligation does google owe the user, likely none.
Customers: Well now, here's a pickle the government could and probably should use to beat google with: adwords. google's customer's are the advertisers, google owes a duty to the customer. I don't think it would take much digging at all to find out that google oppresses competition in the adwords "auction" in favor of it's own products/services/investments.
Would it be fun to see the government force google to show us to their visitors, sure, in the short term. Until the government came around to tell me I had to start promoting my competition on my website, then not so much.
If I were to discuss google with my representatives and/or attorneys I would be discussing how google is harming it's customers via their adwords product.