Clearly most people have never seen sausage being made. What do they think “beef and beef by-products” means?
People scare easily. They will swear off McDonald’s forever, and then buy two hot dogs at the ball game.
I have seen how actual sausage is made, and by modern standards it’s gross, but it’s also been made the same way for thousands of years.
The idea that we should only eat the animal muscle, and discard the rest of the animal is a very recent development (as in, the last century). Throughout most of history, people have eaten every part of the animal (hence the old saying “we ate every part of the pig except the squeal”).
If you're afraid of eating all those funny bits of the animal, then you just aren't a cool hipster foodie.