The All-American Canal is a "stop sign" (thanks, Christine, for pointing that out) and should be acknowledged as such and its lawful purpose enforced.
People who can legally enter this country are required, in most circumstances, to do so through the ports of entry. Those who try to enter illegally, and choose to cross the canal, do so at their own peril.
People who drown in the canal are casualties of their free will. They choose to break a law that would otherwise protect them and thereby put themselves at risk.
Reality operates on the principle of cause and effect. The people who enter into water that is over their head and can't swim "advertise" reality by drowning.