It was already the case that Martin was paranoid about people - especially gypsies - breaking into his property;
Looks like his "paranoia" was quite justified; I seem to recall that Mr. martin was burglarized on several occasions prior to the incident in question. I also seem to recall that the local Constabulary did precisely squat to solve the problem before the shooting occurred.
I'm not too surprised, though. A study from Cold War days has shown that there is such a thing as "professional kinship". A plumber in the US, for exapmle, has more in common with a Russian plumber than either of them do with their non-plumbing countrymen.
It only follows that the professional looters who make up the "progressive" solcial democratic government of the UK feel more kinship with the "traveller" freelance looters than they do with regular peons like Mr. Martin. They'll go to lengths to protect their thieving colleagues from Tony Martin, but they won't lift a finger to safeguard either Mr. Martin or his property.
Always remember that the entire problem could have been avoided by those "travellers" not repeatedly helping themselves to someone else's property. They initiated the confrontation by robbing another man of his possessions. The government failed Mr. Martin by failing to safeguard his right to *not* be burglarized. The robbers forfeited their own rights by attempting to deprive someone else of his rights by force.