The answer to #1 is, I think, more complex than I'm willing to commit to, but as I recall, it had to do with Damien Knight recommending Haefner as a compensation for getting Alice Matrix comatized as well as the fact that he was on the Echo Mirage team and could be trusted. Don't quote me on that.
As for #2, System Failure pretty much implied that Colloton was in cahoots with Alamos 20,000 after she used the same quote as the Alamos girl who kidnapped Kyle. The fact that Colloton is a two term president now was pretty good motivation as well.
That's about a definitive as you're going to get. No one is going to put out anything that spells out what happened in black and white, but much like you're pretty sure Shane and Butch & Sundance bought it, you can be pretty sure it was Colloton's doing.