Kudos to the Rams for trying to address this but, control what you can control. Climate, demographics and migration isn't one of them.
If the North American climate was reversed East to West and North to South, cities like Philly, New York, Chicago and Boston would be trying to keep opposing fans from invading their stadiums too.
Little boy Johnny the Rams/Chargers/Niners/Cardinals fan living in the West in a die hard sports family doesn't grow up and decide to move his family East and retire in Philadelphia...and go to the Rams game at Lincoln Financial Field.
Calling LA fans bad fans is another lazy take.