My future interest against Mexico is probably no different than you future interest against the Cubs I guess...they're the US biggest rival, their fans are all over the place here, every time the US play in PHX it's against MEX and 90% fans are for Mexico, etc....I don't want them to advance. Would I feel bad for them? Hell. Fucking. No. But that's not necessarily why the bets are against them.
If they don't make it through, there are two other teams that won two games also...and sorry I've not been overly impressed by a team that was borderline limping into the WC in pretty poor form, played what appeared to me to be a very lethargic German team in that match that MEX should have won by 2-3 goals, looked pretty pedestrian against a Korea team I vastly overrated and allowed the Koreans to score, to win that one by only one goal....they aren't as great as what everyone seems to be thinking, at least they haven't been in these eyes.
If they don't advance, they will truly have themselves and themselves only to blame. Hell the ball is in their court today. But if they've been that great, they wouldn't be in any position to lose via tiebreakers.
All that said, glad you're enjoying the WC, leggo Germans!