they can't accept it when you explain the environmental impact, goes against their programming and holding contradictory opinions.
The Green Party squirm when they're confronted.
The Serria Club famously wanted to reduce mass immigration in America and argued overpopulation was a significant factor in the degradation of the environment. In the mid 90's this position was was abandoned after a hostile takeover,
$200 million in contributions by one donor and most of it's members leaving in protest on the issue.