It’s called supply and demand. They know there is a demand for meat so they grow animals and feed those animals plants. Continuing to eat meat supports a system that consumes more plants than a system where humans only eat plants. You shouldn’t need your hand held for this, it’s pretty basic stuff.
If everything you say is a lie, then the statements ‘everything you say is a lie’, and ‘you always tell the truth’ are both lies. Which means the first statement could be that some things you say are lies and you always tell the truth is one of those lies.