Wasn't he on probation from an earlier offence? Then reoffended?
I f he pled guilty, why keep him out of jail? Pleas usually result in less time served than a retrial and conviction. If he knows he's guilty and evidence won't exonerate him, why waste money? He built the reputation that makes convictions easier. It's unfortunate that he broke laws. If you all think he's the best thing ever, change laws, I guess.
I'm not a UK citizen so I don't have rights to say how things ought to be in their country, but it you don't like things, I imagine you can vote and you do have representive govt.