Aha, so all those people whose death President Reagan was allegedly responsible for were leftists. Being a leftist means denying the rights of individuals to their lives, property, liberty, and the pursuit of their own happiness. While a person may temporarily become a leftist out of honest error (President Reagan made that error himself), anyone with half a braincell is bound to find out very soon what the left really stands for and, if he is any good--if he is any grayer than pitch black--he will correct his error by coming over to the right side.
Given the possibility of error, rational societies do not punish mere adherence to evil views by death (or in any way at all) in times of peace; they only punish actual violations of rights. But that doesn't change the fact that any person who knowingly and purposefully supports an evil ideology is guilty of a moral crime of the worst kind.
Not that the deaths we are talking about were peacetime deaths. In a war, the people on the right side have to defend themselves and defeat the evil side, without regard to civilian casualties. The moral responsibility for any and all deaths of innocents in a war lies with the evil side, because without it, there would be no war in the first place.
Out of curiosity, since you so much insist on there being no black and no white--may I ask you why your soul isn't white? (If the question isn't clear enough: What crimes have you committed?)