When I see young people walking in their ignorant parents' footsteps I feel so sorry for them. It's like when a parent chooses which outfit a child will have to suffer with, but in this case what personality and beliefs they will wear to make the public suffer.
You're a product of ignorance and you don't even know it, and that is what is dangerous. When you can captivate the hearts and minds of young, impressionable people you harm and stall the progress of humanity. When you have people who believe God can make a planet out of nothing, so much as to worry not of the consequences of our actions on the environment, you put everything at risk; therefore, it is extremely dangerous to choose to be ignorant to things because you find them unsettling. Sure, you'd make people happy by telling them the Sun will never expand and engulf the Earth. But they won't be happy when the Sun is approaching and it is too late to do anything about it.
(Trying to explain how ignorance can be dangerous. I really hope that is the topic, if not I'll edit this~~)
BTW, what is the general atheist view on recreational drug use?