definition of anarchy:
"1. a state of disorder due to absence or non-recognition of authority or other controlling systems."
No, I'm not advocating that, and you seem to have arrived at such a conclusion without properly reading what I've written.
There has to be legal sanction if an individual deliberately goes too far in the defence of their property. But currently - and certainly in this case - we have a situation where the householder has been sucked into a very nasty situation, which in every sense was not of his making. We should always have uppermost in our minds the fact that if Benford and Paul had not committed a crime in the first place, there would have been absolutely no incident.
We then surely have to realise that White is a human being with normal emotions, that everybody reacts differently under threat and that there is no useful little handbook for householders on what to do in such situations. He was jailed for 22 months and now faces being sued by the criminals, whilst they got off very lightly. Sorry, but the balance is not right.
Also, you're jumping to unproven conclusions by assuming that he went after them to deliberately knock them down, as opposed to just giving chase and maybe trapping them, or following them to wherever they were going. This is what he actually said: "Mr White, who told police at the accident scene that he had lost control of the vehicle when going around a bend, was arrested on the spot on suspicion of GBH." SOURCE.
When you say this: "but what of the next case perhaps someone doesn't like someones lifestyle, or race, or philosophy.", I think you're falsely conflating two totally separate issues. The two are so wide apart that I doubt you can truly be serious. The incident in question is totally unprovoked by the victim, whereas attacks based on lifestyle, race or philosophy have an aggressor and a victim. Both White and your hypothetical target of racism etc, are BOTH victims.
The overriding principle in cases such as White's should have at their core, the fact that the incidents are not of the householder's making, and reaction is often based on fear, emotion, panic and sheer survival instinct.
In White's case, the fact that he's suffered a far worse life punishment than the criminals who targeted him is utterly appalling, which is why he's attracted so much sympathy from the general public.