weeds are removed for good reason, though. they are an invasive species with little value and they will end up killing off the rest of the garden if left unchecked.
The heavy handed metaphor is one plant being a cat and the other a rabid leopard. Even if you love all animals, you and the cats aren't safe with a leopard wandering around. But I'm sorry that some parents are so impatient with their kids that they can't break this down to them logically.