When someone kills another, not all such actions are intrinsically evil. For example, the accidental killing of one person by another would not amount to an act of intrinsic evil. Nonetheless, all unjustified acts of killing another are intrinsically evil. Thus, the act of abortion is intrinsically evil.
Not all wars are intrinsically evil (even if all wars contain evil). One can, under right circumstances, using the right means, engage in a defensive war. But all unjust wars, because they are unjust, include unjustified acts of one person killing another.
Therefore, all unjust wars are intrinsically evil.