>I was unaware that Mexico has mass political repression
Interesting, then you should really read almost any basic summary of Mexico's current government.
http://foreignpolicy.com/2016/02/23/obama-pena-nieto-mexico-...
Not to mention asylum in the US isn't only limited to political asylum
>an applicant must establish that the government is either involved in the persecution, or unable to control the conduct of private actors