Nenshi and integrity in the same sentence brings to mind oxymoron.  
The same mayor who is closing a mobile home park putting low income residents on the streets.  The same mayor who promised those residents a new location, then cancelled the new park and said he hoped private enterprise would find a solution.  btw private enterprise didn't come up with a solution.  The same mayor who insults his fellow councillors and Calgarians.  The same mayor who has raised property taxes at more than 3 times the rate of inflation.  The same mayor who campaigned on "openness leads to good government" and yet his meetings have had more in camera sessions than any other administration.  The same mayor who won't release city reports citing "privacy". The same mayor who sells his time for campaign donations.  Integrity?  I think is the last thing anyone should associate with Nenshi.  However, I don't think taxpayers should fund the arena.  Even Nenshi gets the decision right every blue moon.