Sausages were developed, probably thousands of years ago to find ways of using the remnants of a carcass that are not suitable for wider use. Nevertheless, many of those despised ingredients processed left over parts of a pig including blood, guts, organs and, of course, head meat Do occur on the menus of good restaurants
Ox cheek and pigs cheek occur regularly on the menus of good restaurants and black pudding is made from blood, then there is haggis - Then what is wrong with offal? Liver bacon, heart, brains and balls are all seen on the best menus. Then there is tripe and haggis Haggis, the national dish of Scotland, a type of pudding composed of the liver, heart, and lungs of a sheep (or other animal), minced and mixed with beef or mutton suet and oatmeal and seasoned with onion, cayenne pepper, and other spices. The mixture is packed into a sheep's stomach and boiled. It is delicious.
Like many I wouldn't eat all of these myself, but chacun a son gout.
I now eat much smaller portions of meat than I did, so that I can afford to buy meat that meets the high welfare standards of organic producers or similar. All our meat comes from a local farmer/butcher.
However I am an omnivore and I am a disciple of Michael Pollan, who says 'Eat well, not too much, most of it plants' and plants do indeed form the main mass of my diet and always have done..