Euthanasia is intrinsically evil, and intrinsically evil acts are always immoral. The main problem in Catholic ethics today is that certain intrinsically evil acts are “popular”, and people try to find rationalizations to justify them: lying, contraception, use of abortifacients, various sexual sins are all intrinsically evil and never justified. It is a difficult teaching because it means that, in certain cases, people must suffer greatly, rather than sin.