Proving non existence in impossible and only takes one case for it to be disproven.
If you're willing to take my word for it: it is possible. I've met those who have radically changed themselves, and have met others who walk the path (& the latter are amazing enough).
Darkness doesn't exist where Light does. It's a matter of sacrificing the darkness for something better.
Remaining staunchly skeptical, distrustful, or scoffing the path is a sure way of not seeing it. It requires objectivity, particularly in spite of one's own prejudices.
In my experience, this is impossible. Light is defined by darkness. Enlightenment must contain both. Trying to extinguish darkness is doomed to fail