The answer is that take no chances whatever. Deter, as much as possible, those who will seek to destroy Israelis. The real question is why Hamas doesn't do anything about this kind of behaviour by those who apparently are not mentally able and the answer is because Hamas doesn't want to do anything about it.
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Hungarian police detain two suspects in murder of Israeli tourist Ofir Gross (Haaretz)
from the article: IDF kills Palestinian approaching Gaza security fence