What I would say is that there's an important line between acting in concert with like-minded allies and abdicating the sovereignty of our foreign policy.
Committing to something only if it is done with others would be a bit of an abdication of the independence that we can exercise. As one of the members said, we have an independent foreign policy and we can choose to act according to our own values and objectives.
Having said this, I will reiterate that yes, one of the important considerations is whether this.... Whenever and if the government chooses to go that route, an important consideration would be to assess what others are doing and to consider the weight of going at it alone versus going at it with a larger group of countries.