Just got caught up on your report, thanks for sharing. Mexico can be amazing but I have never travelled there by bike, hope to sometime soon.
Grew up in Pasadena and the OC, went to Rosarito and Ensenada areas several times for the surfing, nightlife and fun - it's true what you say danger can be anywhere but we are often the cause of the spectacle.
Also, I like what you said about our infrastructure here in the US - it's sad but true. A friend visits China now and then and Shanghai is ultra-modern with sleek roads, hotels and hi-rises - they are quickly becoming the USA of the 1950's while we move toward what they were decades past.