Why do all the hate mongers want dexter to burn in hell or not get away with what he has done? on the other note, what do you mean by justice? this is exactly why dexter was made in the first place, to question our own conscience and choose between what we think is right and wrong! i can agree to a certain level of certainty that the ending will be unexpected for most of the people and it really does not matter whether he gets away and leads a happy life or dies or get caught by the police. What matters is that dexter has changed after such a long period of struggle and has finally started to take such decisions in life that is better for him as a human being in the long run emotion-wise and not as a psychotic rage-full killer...
If in the end, he can get away with all of it then so be it! politicians and gangsters do bad things and get away with it all the time, then why can't a serial killer who has a high morale and knows when or how to punish the culprits or considers himself as the guardian of city Miami? Why can't you see justice being served to a just person? Dexter deserves to be happy, and live a loving life with his son and hannah!! You are perfect dexter, just the way you are