There are several questions wrapped up in that. I prefer to start with the situation in which things pay for themselves and to try to devise solutions whereby things pay for themselves. A couple of years ago, I had an article in The Toronto Star, which you probably didn't see, about how the Spadina subway extension could be made to pay for itself. This is my initial working philosophy. I'd be happy to distribute it.
This is my approach to high-speed rail in Canada. First of all, start figuring out how it could pay for itself. Then, if you find that you really do need subsidy, apply the subsidy. Where should the subsidy come from? Well, I don't really care myself where the subsidy comes from. If it's a real subsidy, it's going to come from government, because no private sector organization is going to donate it.
If it's one of these things where the real issue is the risk rather than the actual amount of money, I don't mind the private sector doing it. But I must say that the private sector ventures I have examined in some detail, including the London subway, the London Underground, have not provided a lot of useful arguments for the people who support the P3 principle.
I don't have an ideological position against it. I don't think the data are in their favour, though.