It could change things - cases like this, now it has so much momentum from the public interest, do change laws, procedures, social care systems, understanding of abuse patterns... It is giving little Arthur the voice he never had in life, people are outraged and that could mean some changes happen. His legacy could then have some positivity. I think that it is right that people see these vidoes, it is incomprehensible to most decent people that there are human beings that would behave in this way so it opens up peoples eyes to what could be going on within other homes and understanding that abuse is going on behind closed doors all over the place; that may be hard to see, but it is necessary to drive change.
Also the more people see of this horrific case, the more infamous they will become and therefore the harder it will be for them to 'slide under the radar' both in prison and in later life and for me personally I can only see that as a good thing, neither deserve a 'quiet time'.