1) If you eat plants, you're not killing, but you are raping and pillaging the food source and/or homes of other animals and insects.
Have to agree with that. Most of the deforestation in Asia is occurring due to the clearing of land for paddy farming. So we cannot say that vegan lifestyle is environment-friendly.
And how do we feed the cows that we eat? What is causing deforestation, is mostly soy and corn fields that are used almost exclusively to feed the animals. Eating the plants ourselves is more economical - we need to feed a cow 10 calories that come from plants, for it to give us 1 calory of meat.
So being vegetarian and directly eating plants is more energy-efficient, and contributes in reducing deforestation.