[SDCBC] Safety of "going south"?

[Jim Baross]

My house guests who are embarking on a bike expedition to/through 
SoAmerican are wondering about the recent spate of robberies of 
tourists in Mexico and what the safest route through Mexico might be; 
what should better be avoided?

Baja through TJ?
Baja through Tecate?
Mainland Mexico?

Any info?