It's far from the only case of this type, as you know, and the principle will wrangle on as long as cases like this continue - where the judiciary makes it abundantly clear that it favours the criminal and comes down like a ton of bricks on the guy who hasn't thought like a lawyer in the middle of the night, but has protected his property the best way he knows how.
The majority of the public, quite rightly in my view, hold the strong perception that the entire legal system favours the attacker criminal rather than the innocent defender of his or her own property.
Incidentally, what makes you believe the programme was produced for "entertainment"?
Moreover, defending oneself from direct attack as with a break in, is not "vigilantism". I think you're getting "law enforcement undertaken without legal authority by a self-appointed group of people.", confused with self defence.