It's not illegal.. You may not like it or agree with it but it isnt illegal like you've claimed and BC's supreme Court has already ruled on this twice coming to the same conclusion both times.
The 81-page decision found that a prohibition on camping breached the homeless people’s charter rights to life, liberty and the security of person.
“To criminalize people for being in a park overnight, to stop them from setting up a shelter, is a violation of their rights,” said Larkin.
“To constantly displace people puts their health and safety at risk. It creates inordinate psychological stress and those are not laws that can be upheld in this country.
https://globalnews.ca/news/2289848/b-c-supreme-court-says-homeless-can-camp-in-parks/