I really question whether you have spent a lot of time in DR to make this post. I don't actually like beaches all that much and that's why I hate islands like Antigua (been there 9 times) Barbados (11 times) Dominica (4 times). Absolutely zilch to do in those places. DR, in my opinion, is packed with things to do that don't involve beaches. The capital is a huge city, almost the same size as Los Angeles, with a world of things to do, great nightlife (normally in any case), good shopping, parks, museums, historic sites, bars, restaurants, the list goes on. The interior of the island is fascinating, the mountains are breathtaking, a drive through the agricultural areas is interesting. You can do adventure sports like whitewater rafting in Jarabacoa, mountain biking, rock climbing. You mention safety, but compared to countries like Jamaica or even Mexico we are way safer and especially for tourists in AI's it is rare to hear of anyone having serious problems. Anyone who interferes with the tourist dollar on DR gets dealt with very quickly by the police.
I would also take issue with the idea that the seaweed will ever cause tourists to stop coming. I believe that some airlines and holiday companies have always sent their customers an advisory that there is a risk of seaweed in Punta Cana, and so far it doesn't seem to have put people off.
On your final point, have you not noticed that the current president is trying to do just that? Eliminate corruption. Ensure rules are enforced. Sure that can't have passed you by?