Is that aspect the issue though? It isn't like government here wasn't able to pool the resources - it s that a) the high cost of what was chosen and b) the susceptibility of what's been proposed to changes of government/government priorities. Also some of the European examples cited also had a history of transit building being delayed (notably Amsterdam). More fundamentally perhaps it would be instructive to look specifically at the "transit constituency" of each jurisdiction and see how it compares and contrasts with the situation in North America and TO.
AoD
I think multiple factors are at play. The high cost of transit construction in Toronto is certainly a factor, and deserves its own analysis. To what extent is it technical (soil conditions) vs labour market (salaries of workers are high compared to other places) vs political (opposition to elevated), etc.
The lesser willingness to rely on the government in North America plays a role, too. I noticed that it is hard to find a place in Europe, even if it is a small town, where relying on transit for mobility is totally impractical and everyone needs a car. Small towns have usable local bus systems and many connected to passenger rail lines. In Canada, it was a common situation until recently, pretty much everywhere outside the 15 or so biggest cities; even in the satellite regions like York or Durham. It used to be even worse in the U.S., some relatively big cities having very limited transit options, although they are making big improvements lately.
As of delays due to the government changes and shifting transit plans, I heard / read about such events in many jurisdictions and my gut feeling is that we aren't unique. But I have no stats.