To be honest, you suggested she was calling for "vigilante justice". My post said she was not, and gave reasons why.
As to her irrelevance to the legal issues, I disagree. She and her family hit the ground running when they got to Aruba. They are the ones who turned up Joran and the Kalpoe brothers, not the Arubans. And when they did, then the Arubans let those three go and arrested some black, innocent security guards on the word of the three liars whom Beth and her family had turned up in their OWN INVESTIGATION.
And the Arubans did not do proper forensics at all on the items they should have that were belongings of those three. That is just a fact. If they did not have that capability, and if they could not move quickly, then the FBI could have done so if they had been asked and allowed. But they were not.
And now 5 weeks have passed. Unforgivable in a case like this. The family has been forced from day one to investigate this themselves. They are more than just desperate, upset people.
I would also like to add that the reason people should not vacation in Aruba is all in your post. It doesn't matter how wonderful the Dutch legal system is. There are corrupt people in charge in Aruba who would allow the last people seen with Natalee all the time to clean their vehicles and dispose of evidence, because they are well-connected, while believing the liars' stories and arresting innocent people.