2. It is fine to determine everything by majority vote and not by consensus. It is fine only if the loser accepts the winner. But when the loser refuses to accept the decision of the majority and launches a campaign to undermine the party, the only result would be a split and therefore a weakening of the party.
3. With UMNO the loser took the case to court and the party was made illegal. When revived it lost a huge chunk of the members.