I don't think anyone on this board knows much about this case but doesn't it seem odd as you say this is not being pursued?Best thing is to tell everyone to Avoid Majestic Elegance in Punta Cana - because that guy is apparently still there and this won't be his last attack. Only next time he may actually kill his victim.
Not many countries where this would not be pursued...but here he gets to walk and rape again.
I can think of several recent crimes where the DR got their man........... Dutchman case, home invasion, missing NYC couple, tourist walking the malecon, anyone think of more. Just seems to me if the PN has sufficient evidence they follow up.