Because they are inseparably wedded to capitalism while at the same time understanding themselves as being "the left", the guys who wants to do good stuff for common people.

If they win, being the "good guys" means that they are expected to do good stuff, they even expect it themselves, but their firm ideological commitment to capitalism prevents them from doing it. This leads to all sorts of confusion and disappointments.

On the other hand, losing allows them to claim the moral high ground for free. They get to be people who wants to do good stuff without having to do any of it.