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You could argue that the ones that didn't develop the toxins don't mind getting eaten.
You could argue that the ones that didn't develop the toxins don't mind getting eaten.
That's the case for most fruits.
Those species just "choosed" to follow a different strategy. Less expensive. Resources are liomited and you can spend your resources in making complicated poisons or in making more seeds. In the end is all about how many seedlings survived.