I've already got my vengeance worked out should anything like this happen to anyone I know. The old saying: if you want something doing, do it yourself! In this case, it is justice, as the police and judicial system don't appear to be fit for purpose!
No doubt the police officers involved would have put a lot of work into this, with enormous amounts of paperwork produced to support the evidence, and the CPS agreeing to take it to court. No, what has gone wrong is yet again a court led by a very liberal judge has failed to fully apply the sanction it could have applied, with the victim and the general public given no justice. No wonder this monster is laughing!!

as cherie blair says " do the crime, and we wont let you do the time"
http://www.dailymail.co.uk/news/article-127352/We-stop-sending-offenders-jail.html
No doubt they did, but police put less and less effort into their job as they know what the outcome will be, and who can blame them - they still get paid at the end of the month! But generally speaking I stand by what I said about the police being unfit for purpose. I should know I used to be one and very often come into contact with them still.
Whether or not it's their own fault, that's a different matter. They have their hands tied by do gooders and stupid restrictive laws, nevermind PACE, and the liberal attitude that has swept the nation. Back to basics, I'm not against anyone, but for example, you have lots of big men creating disorder, two 5'6" women turn up (assuming they aren't single crewed), they have no chance of returning to and maintaining order, baton/spray or no baton/spray. Just one example, which people might use to call me sexist, not at all.
From my experience of dealing with the police they just aren't interested, and don't like it when you try to do your civic duty!