I don't think there's ever anything casual about it.
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T-nex's theory could be compared to the culture where elders are always to be respected. In those cultures an elder would never be sacrificed for the good of a younger 'tribe' member. The one with more life experience has the right to live, which is the only right way in my book.
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I don't think that holds up once the younger life form becomes independent of the older one.