Entire pack of wolves shot after escaping Swedish Zoo

An entire pack of wolves has been liquidated at a Swedish wildlife park after escaping from their sanctuary. The incident occurred just days after a controversial nationwide hunt to cull wolves.

The animals had managed to tear down a fence enclosing their sanctuary and were roaming around freely in Skåne Wildlife Park (Skånes Djurpark) during visiting hours. The public was evacuated, and the entire pack was shot, according to the Swedish news agency TT.

A park spokesman said the situation was extremely dangerous, although he added that the public was not at risk.

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I read this a couple of times but am not understanding why they felt the right way to deal with it was to kill them all.

I don't get this.  How long were they missing?  Also, the person who commented on if you can shoot them with a bullet a tranquilizer could have been administered as well.  If they don't have a tranquilizer gun then it's not an option but I sure the heck would have tried everything else in my power before they were murdered.  Is this the same park that had escapees before? 

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The name is very familiar but a search on WHAP does not bring it up.

From some googling for more info, I found:

"Zoo officials said the first escapes occurred Thursday when two male wolves gnawed through fencing around their enclosure and moved into an adjacent red deer enclosure.

The two were shot Saturday when they managed for a second time to break out from the enclosure."

The reason given:

"A wolf pack is centred around the alpha couple where the female is the most important. The chance of getting the rest of the pack to remain in the enclosure disappeared once she had escaped,"

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Is that true, Nakoowolf?  If they gnawed through the fence, they should have reinforced it or something?

edit:  12 wolves were killed