Why do sororities even exist?
The tribal instinct remains strong. Human beings tend to feel more secure when they can form themselves into groups with whom they identify and that exclude those with whom they do not identify. The "secret rituals" are one of the key ways of reinforcing this feeling of being in a cohesive tribe, protected against intrusion from outside.
Some fairly modern tribes, such as country clubs and gentlemen's clubs, are now legally constrained in their ability to exclude members they feel uncomfortable with. Criminal tribes, like the mafia and yakuza are typically particularly careful about the members they recruit, and have many rituals designed to inspire loyalty and the feeling of exclusivity.
Regardless of type, the instinct we have to form ourselves into tribes remains, long after it outlasted its useful protective purpose in primitive societies.
the rate of youth suicides haven't [sic] gone up
I cannot find a reliable recent source on this. However, older data suggests that the suicide rates for older people has been going down, but there is an uptick in rates for younger people. For instance, see Suicide rates by age from American Foundation for Suicide Prevention (based on CDC figures)
... anthropogenic global warming is not a grave threat to the planet and that climate change is being used as a scare tactic
Sure, in overall terms, global warming is not a grave threat to the planet. It is probably only slightly more dangerous than a catastrophic meteor impact. Apart from some coastal areas, the fundamental shape of the continents will remain pretty much in place. If you do not care that most current animal species (including our own) will not be part of the picture, there is really nothing to worry about.
Using the WayBackMacine to archive the site is risky. Recognize that one line added to the robots.txt at any point in the future can render all the content inaccessible (at least) and possibly cause it to be deleted.
I am quite surprised IBM, Microsoft, Google or one of the other big organizations has not picked this up.