As always happens when ever this subject is raised, opinion polarises between the 'got what he deserved' and the 'reasonable force / vigilante action'.
I have to repeat, as i always do at this juncture, that laws are what make us civilised, and flawed though our legal system is, it beats 'survival of the fittest' by a country mile.
The legal approach to burglary may well be lax, but that does not excuse or condone premeditated physical violence which cannot be seen in any way as 'defence'.
Of course out instinct is to protect our homes and loved ones, but the law has to be the famework in which we live, and it does not bend to suit any kind of 'justification' - nor should it.
The householder was - as the burlgar - guilty of his offence and punished under the law.
The appropriate level of sentencing for either is another debate entirely.