Since Muamba's collapse there has been a very deliberate media campaign to garner public support and sympathy for the man. While I do not disagree with this in principle and have no ill feeling towards the player, I believe much of the media coverage has been completely uneccessary and is far from being in the nation's interest.
I personally find this supposed outpouring of Diana-esque public sorrow and sympathy rather false and pathetic. If you wish to pray for him for example, by all means do so but why must the intention to do so become public? As is so often the case with this type of thing, it has become less about Muamba and more about the individual supposedly grief-stricken by their plight.
I'm only guessing here but it may be the case that these tweets were the product, not of a racist intent on inciting hatred but purely as an act of rebellion against public opinion. Regardless of his motivation and level of belief in what he posted, a prison sentence is a ridiculous overreaction, not to mention a complete waste of public money.