I live 10 miles from Banff and i never heard about this ...... come to think of it ! ...... i didn't know Banff had a national park 
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We have the same problem with our beaches and riptides, people just don't take care and ignore all warnings even when the lifeguards tell them to get away or out of the ocean.
We have that same problem along our coasts. Plus, we have idiots who will try to pet or kick alligators in the wild.