Earlier quoted context omitted.
What if you publish a negative review of a restaurant? Now it's super easy for them to find you and possibly harass you. What if you're in a marginalized group? Now online harassment can move into real world harassment if you've reviewed local places you enjoy. Lots of people are harmed by a "real names" policy: http://geekfeminism.wikia.com/wiki/Who_is_harmed_by_a_%22Rea...
Why would Google show a negative review as an "endorsement"? If you rate a restaurant 1 out of 5 stars, Google isn't going to show "Cloudwalking rated this 1/5 stars!" in an ad.
Confirmation bias tells us that negative reviews will always be more numerous than positive reviews, however those people writing negative reviews will feel a stronger cohesion with each-other. As such, negative reviews will be more valuable to how people form first impressions.