I think the key thing to remember is that the Force is mysterious, and even the Jedi Order (probably the galaxy's leading experts on the topic) didn't have all the answers, or generally claim that they knew with 100% certainty how the Force operated on a grander scale. Something like purging a dark side site should be the focus of an entire story arc that takes several adventures to complete, as it's a major accomplishment.
That's what this is. The entire story arc is these two padawans having to fix the mess they created by opening pandora's box on this native planet.
In the beginners game you must meditate wiry the gatekeeper to cleanse the temple. One of the sessions I ran in a dark temple, I made them destroy a large glowing kyber crystal that was tainting the world around it.
Do you mean the beginner's game in the Force and Destiny Corebook? Or the campaign that came with the Force and Destiny GM Screen? I have both of those, but didn't bother to read those modules, as I'm not running those.
Well given that the Jedi know of many darkside places and near as I can tell they have never purged them I think it can't be done. If it could I am pretty sure they would have done so. Same goes for Dark Side Holocrons. They lock them up. As they have no ability to destroy the taint.
Well given that I'm the GM and it's my campaign, I'm saying that nobody every thought to try and do it. I'm asking for ideas on how to accomplish it. I personally take issue with the idea that it's impossible to purge a dark side location, considering a location that wasn't tainted can become tainted. No reason it couldn't be purged in some way, other than "we've never seen it done before".
No need to get snippy about it. The material we have implies it can't be done. As I am sure the Jedi would have tried. You can do whatever you like in your game. Just telling you what the evidence we have in the universe implies.
I wasn't being snippy, I was pointing out that your answer didn't actually address my question. Like I said in the original post, I was pretty sure it wasn't something actually covered, but that I was going to do it, and I wanted advice on how to mechanically do this. You saying "It can't be done" doesn't actually address the question at all.