Of course everyone loses to an extent in a collapse but power is relative. And short of a meteor collapses are usually partial (e.g. the roman empire fell but the church remained and consolidated power).
You can only paint with a broad brush but it's not exactly hard to pick out groups that will be net recipients of relative power and wealth in various collapse scenarios.
If the financial system collapses people who own capital in whole (e.g. some tradesman with his van full of tools) and people who own "promises" of things (the contents of your 401k, bank account, etc) lose. If high level government collapses people who are associated with alternate sources of organization and administration (local government, the church) win. If local government collapses people who depended a lot on those services lose and people who already went without win.
Remember, money and political capital are convertible to each other to an extent so that complicates things as well.
So it's perfectly rational for people to root for the kind of specific tumultuous change that would benefit them.
