This could have been prevented if they didn't allow homeless people into the station. Just like 99% of the problems that happen in subways. Crime, filth, public urination/defecation, loud music, etc., it's all caused by fare evaders.
And yet, stations will never do anything to stop them. Those useless people sitting in the cage with the computers will watch them go in and do and say nothing.
This is why I have been largely fare evading for almost two years now.