What if their oldest loses their job and can’t find a new one, but has to move back, and then can’t because they downsized to a smaller house?
What if their oldest loses their job and now for no fault of their own the renter is suddenly forced to find a new place to live to accommodate the landlords son? But they’ve been spending their money on rent so they don’t have enough savings to find a decent place?







Evolution doesn’t work that way. It’s not picking and choosing traits. It’s not making analysis.
The quokka just survives to pass on that trait so it persists.