This whole "it was years ago, they've changed!" argument. I see it thrown around whenever some e-celeb is revealed to be an awful person. Niall hasn't changed as he did just about everything to shove this all under the rug. Fans are easy to manipulate because they'll do anything to talk to their favorite YouTuber. A Internet famous animator known as Schmorky was outed for for using a 16 year old fan for pedophilic ERP. The 16 year old released the messages on this forum and explained that she only dealt with it because she was a fan who wanted to talk to Schmorky about stuff like art/animation. It has happened before, and can happen again which is why I don't let Niall off the hook.
The thing is, to show that you've changed, you have to be honest and upfront if you're in a situation like Niall's. He fought tooth and nail to make sure people believed he didn't do it, only to admit it when the evidence against him was too strong. He didn't even do that properly, he still fumbled in his confession and sparked vitriol within his fanbase against those who spoke out about his wrongdoings. There aren't any more recent allegations, I'll give you that, but I'm concerned since he still has a young audience.