A few quotes from the Rabbi on 'Redemption of Israel'
in which he teaches not to fulfill the commandment of Amaleq out of rage or vengeful passion.
"Therefore, when the LORD your God grants you safety from all your enemies around you, in the land that the LORD your God is giving you as a hereditary portion, you shall blot out the memory of Amalek from under heaven". This confirms that all commandments should be fulfilled for their own sake. Had the Israelites annihilated Amalek immediately upon their entry to the Land of Israel then they would have done so out of rage, out of passion for vengeance, and not for the sake of the commandment. For this reason the Torah commanded the Children of Israel as follows: "Therefore, when the LORD your God grants you safety from all your enemies around you"– so that they might do so for the sake of the commandment.
Likutei Nissim, Parshat Ki Tetzeh, p. 287, published by the author, Tel Aviv, 1971