A few quotes from the Rabbi on 'Love of Israel'
in which he teaches that the essence of love is to rebuke, since it is very hateful to leave them to their foolishness
Part of the love of God is to love all people of Israel with heart and soul, to fulfill the commandment "Love your fellow as yourself" which is equated to the entire Torah. The essence of love is to rebuke and guide others in the ways of God, for if one does not rebuke them and protest, they will be left to their foolishness, and there is no greater hatred than this. Just as the commandment to "Love your fellow as yourself" is equated to the sum of all the commandments, so is the negative commandment "You shall not hate your kinsfolk in your heart" equal to all the transgressions. One should take care to not hate any member of the nation of Israel, and if one has been transgressed against – he should forgive immediately, and always defend and advocate for the People of Israel, in particular in the holy city of Jerusalem. This is indicated by "and you shall see the good of Jerusalem", meaning: See the good ones among them and not the bad ones. The Temple, because of our transgressions, was destroyed by the sin of gratuitous hatred; if so, one's acting in live and peace with Israel hastens the Redemption.
Oneg LeShabbat, Part A, p.34, La'or Digital Plates and Printing Ltd., 2010