How come there is Kfar Chabad in Israel? Why have they decided to make an oasis for themselves? (Please don't take this the wrong way, this is just out of curiosity. Thank you)

As is often the case, the answer to such questions is more historic and technical, and less ideological. Simply there was a small group of Chabad Hassidim who were new immigrants after the Holocaust, who in order to support themselves, wanted to set up a collective agricultural settlement, similar to the many kibbutzim and moshavim founded at the time. They're no different ideologically than other Lubavitchers, and today, most of the people there don't even work in agriculture, and economically, are no longer communal.