The tunnels dug under 770 and the subsequent damage caused by the attempt to connect them to the main synagogue building were rogue acts of vandalism committed by an overzealous group of youngsters. These were undoubtedly criminal actions, but they in no way represent the Chabad-Lubavitch movement.
This whole situation has been blown massively out of proportion. The students behind this simply wanted to fulfill what they believed were the Rebbe's wishes — they were misinterpreting the fact that most of the community would likely favor an expansion of the synagogue. These young men are naive, but they are far from criminals.
There's a 50% chance that at least 114K US Jews will move to Israel by 2050, according to the Metaculus prediction community.