Have we evolved to eat only cooked meat ? (even though I know we can eat certain raw meats)

Parasites can be a problem with uncooked or undercooked meats.

Fire treated food made a lot of vegetables and meat edible and / or digestable for kids and older ones.
In conditions when (hunt / recolection and later) most of human effort was spent in getting food for survival, it become a evolutive advantage.

Most uncooked meat is tough and chewy. Slow cooking sometimes makes meat more tender.

I have had both Carpaccio and beef tartare, and they are quite good.

Some thing warm or an early form of bbq

Raw meat tastes better but you have to have a stronger stomach

Eating cooking food makes a human, a human being.

Sort of? Mastering fire was pretty early in humanity's development so whatever natural resistance to food borne illnesses we used to have is probably gone.