I do agree that there are a lot of people eating too much meat, but the diseases you mention are all caused by overeating in general, and are just as easy to get on a vegan diet.
No. I said a balanced vegan diet. Even over eating whole grains, vegetables, fruit, nuts, seeds and legumes whilst not eating foods that have cholesterol (meat, eggs, dairy - literally any animal products) plus the evidence of red meat and processed meat causing cancer, means I do have much less chance of having any of those diseases I mentioned.