Heck, you could say that he did everything he could to keep the Dodgers in Brooklyn. As the following letter below, that is available from Heritage Auctions and written by Walter O'Malley to a desperate fan, can attest.
O'Malley writes back:
"I have your letter, but I wonder how carefully you read the newspapers. They very clearly stated that we want to keep the Dodgers in Brooklyn and were willing to spend $5,000,000 to do so. Progress, however, has been very slow and we will have to leave Brooklyn if there is not to be a new stadium when our present lease runs out."