Gentrification and the Right to the City

This weeks class really got me thinking about gentrification and the issues revolving around it back home in Cincinnati.  Personally, I have only seen positive impacts from all of the work that has been done, because for the first time, I feel mostly safe.  I feel like I can go to the city and have something to do, get a unique bite of food, or enjoy some of the historic architecture.  They have done a lot of work preserving some historic pieces in the past few years and have really "cleaned" up a lot of the area.  But issues have started to arise where it is rumored some places will only let certain clientele into their establishments.  The bulk of the areas that have been redone were abandoned buildings, so there wasn't so much an issue with displacing people, other than the homeless, but rather that the people who once were around there are not allowed to enjoy the new amenities that have been added. I think that going through and renovating and "cleaning" up a place is necessary, especially when things become so run down that it is literally a space for crime, but how it is done can quickly become an ethical issue.  How do we as architects play a role in that?  Do we actually have the power to make an impact?  You could argue that we should not accept jobs that support gentrification, but if we don't, someone else will, so is it better for us to take the job and try to have some control in how it is done?  This is just one example of the many ethical battles we will face once we start practicing.