Hamas is a terrorist organization, if a state leader has contacts with such an organization, he will just help legitimize it. As they threaten us and refuse to recognize Israel's right to exist, such a thing is definitely our business. As for the house demolitions, if someone in your state decides to build something without the right approvals then the bulldozers will likely be sent there aswell, happens in more places than Jerusalem.
Law expanding definition of terrorist activity passes first Knesset reading (Haaretz)
from the article: Russia rebuffs Israeli rebuke over open relations with Hamas