What about fruit? Doesn’t the plant want you to eat it, so it will have less defense chemicals than other plants? Well, it wants SOMETHING to eat it anyway. Not necessarily you. And less defense chemicals doesn’t mean no defense chemicals, either. See tomatoes and eggplants, which are nightshades. And think about how many berries are deadly poisonous. We don’t eat all fruits. We don’t even eat MOST fruits. In fact, there are plenty of examples of fruits that are highly toxic, and may only have one animal species that evolved to eat the fruit and germinate the seed, like the Cassowary bird and many tropical fruits, which are deadly poisonous to anything else that tries to eat them. The Cassowary bird can eat these safely, benefiting the plant, but they are deadly to most other animals, as they don’t want to be eaten by them. Look it up.
And sugar is an addictive substance that is harmful: so getting you addicted to it to move their seeds helps the plant, not you, outside of a quick hit of energy in extreme situations.
Modern day fruits are also nothing like the original plants, as they have been selectively bred to have far more sugar.
Additionally, a plant doesn’t want you to eat it’s fruit if the seed isn’t ready, ie when it’s ripe. So there are a lot more harmful substances when green, and they need to vine ripen to reduce these. In modern agriculture we pick fruit when a lot of it is still under-ripe, and let it ripen in the box or on the shelf. Several studies suggest this doesn’t allow the toxins to get taken away; so they are even worse than normally ripened fruit.
Steak doesn’t have these problems.
