A coalition government is a great idea if you want to pander and compromise your way right into hell...glad we don't have one of those here...
But you are right... Ben-Gurion knew this would happen. He fought for a two party system. But he couldn't get Israel to agree... There are some "parties" in the Knesset who have one seat, one vote, and are able to hi-jack the government for their specific cause. Compromise, compromise, compromise... and you get no where.