I can’t remember where I heard this, but there was some anecdote about a military person dealing with a govt counterpart.
The military person wanted definitive action on something, but the govt counterpart wouldn’t commit. The military person later asked the govt person why they wouldn’t definitively commit, and their answer was something like “if we do, it closes off options”.
Setting aside the whole “they just want to be re-elected” viewpoint, I can sort of see the PM/govt’s stance. It’s polarizing but it doesn’t seem to me like all of our allies are leaning one way and we aren’t - several are also balancing that tightrope. So, there’s not as much political advantage to put all the chips in on one side.
In this day and age of soundbites and media, even saying “we were working with the best info we had” doesn’t really sway many people - this situation is simply too polarizing that as a politician, either one side hates you, the other side hates you, or both sides hate you. But, if you straddle the middle and both sides hate you, you have options to go one way or the other. If you side with one side already, it’s a lot harder to flip (if needed).