Nowhere in the article you linked is said that someone tried to stop him from going in the enclosure. It is written though that the man was suffering from schizophrenia.
Not arguing that any animal should be killed, or spared in spite of a human life, but your argument isn't a good one.
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u/Kennedy_KD Plays MineCraft and not FortNite 5h ago
https://www.bbc.co.uk/news/articles/c60qk8djj27po tldr is last week a man was killed after jumping into a zoo tiger enclosure