Musar על חולין 26:4

Since holiness exists only in the Holy Land, we are commanded to "depart from evil," i.e. to destroy all the sites where the Gentiles have worshiped This commandment applies only inside the boundaries of ארץ ישראל. Our sages (Chulin 13b) have alluded to this mystery when they said that Gentiles in the rest of the world are not considered as idol worshipers. This means that idol worshipers who live in the land of Israel which is under the direct rule of G–d serve Him in an inadequate manner, are heretics. This is what is called idol-true worship. The Gentiles who live in the rest of the world – which is under the authority of negative forces, חיצוניות, however – do not reject the authority under which they live. Just as it is a serious sin to destroy even a single stone of the Holy Temple, so it is a great מצוה to destroy – and never to rebuild – an עיר הנדחת, a city within the boundaries of ארץ ישראל the majority of whose inhabitants have turned to idol worship. Its very site has become defiled. Whatever applies to such a city applies to the מסית ומדיח, those that have seduced their fellow-Jews to turn to idol worship. Uprooting such cities or people is equivalent to uprooting the residual pollutant of the original serpent. Just as G–d cursed the serpent immediately (Genesis 3,14) without making any allowances or even asking why the serpent had seduced Eve, so we too have to deal with such phenomena without our customary recourse to finding every possible merit to save the transgressor from judicial execution. The commandment not to love the seducer enjoins us to emulate G–d's conduct in this respect. Since Genesis 3,15, G–d has made the animosity between human beings and serpents a natural phenomenon, something that we need not, or better should not strive to overcome. The false prophet similarly is part of the phenomenon of the pollutant of the serpent rearing its ugly head.