Think about someone (like a friend of mine) who loves a diet of dairy and meat. Maybe she tried to be a vegan and felt awful, so she tells everyone she is now on the "high fat, high cholesterol" eating program. The more the better, in her mind.
My theory about people who have had this experience (and who have reached this conclusion) is that they ate vegetarian or vegan but loaded up on lifeless processed pale foods, and then, consequently, encountered health problems with that regime, not knowing why. They didn't understand about nutrient loading: dense dark green leafy vegetables and phytochemicals vital to survive on. (Few people back then had an awareness of that aspect of healthy eating.) So they walked around starving. Old-time vegetarians never had the advantage of the research that's now presented in movies like Forks over Knives nor the lectures from both cancer clinics Hippocrates and Gerson, validating that the body doesn't get enough fiber or phytochemicals on either dairy or meat and that dairy causes tons of sinus/bronchial/ear infections.
The cholesterol levels of people whose diets are rich in meat and dairy are likely to be high. (There are theories out there that high cholesterol is not the problem--but that's another matter.) So, we say nothing; each person has to discover it for herself, if/when she will begin to have those other problems.
My friend’s folks raised her on junk food, which is why she tried being a vegetarian for a while. She was having serious health issues over the junk. Subsequently (I think) she reached the middle stage and couldn't "hear" any discussion about all of this. An area of total agreement is about the benefits of eating only real foods, and enjoying eating those together. Life is just too short to try to convince her—or most anyone else--otherwise. This isn't about her, but about the message of someone who recommends the paleo diet.