The Australian Labor party has strict penalties for those who undermine its collective positions, and acts of defiance can lead to expulsion - a precedent with a 130-year history.
This is not unique to Auzzie politics. AFAIK every Westernized nation’s parties follow the same rule.
My question is if your nation touts its democracy as the best thing since sliced bread, how do you mesh that with dictatorial leadership forcing politicians to vote along party lines, especially on something like this?
Enforced conformity is about as undemocratic as it gets, yet I don’t see any big names standing up against it.