Translation of legalmente

for a minute I blamed the burger that I had eaten at the duty free back in Cancun, but thinking a little further I recalled eating street food the night earlier, as it was Mexican independence day.
Once they see a foreign person, their primitive thoughts come up and they start to hate and dislike without any actual reason. Whose fault is this hate? Is the fault of the ones who are afraid.
We spent the entire day doing nothing, just waiting for the night train which would take us into the northern mountain area of Vietnam, close to the Chinese border. The train left at around ten.