When people don't have much to lose they're prone to desperate actions. I bet it was not pleasant for you to get caught in the middle of it.
Still, I can understand why most of them are trying to cross over. The vast majority of those people are looking for some semblance of economic independence, the right to work and earn a fair wage, not to exploit our social system (and we are not a country with such great social safety net to boot, especially for undocumented residents). Even though this may be impossible today, a century ago before Ellis Island/Castle Garden America was truly free, one didn't have to be approved to enter the country.
Just my 2c.
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