I think we should care when Mexico starts writing it's stupid comic books, fails to support us with the war in Iraq, condemns the voters of America for not wanting to do what the Mexican government has never wished to do for it's citizens.
The whole massive immigration problem originates in that corrupt but wealthy country and that's where the best fix can take place. It's not going to get fixed until we actually stand up and tell them it's time to get it done because we're not going to continue this.
Your concern of the internal problems of Mexico is not displaced, but its focus is. We do not have the luxury of waiting for the social, political, and economic conditions in Mexico to improve before we try to reform our immigration policies.