If contact was made, the short term fate of the tribes would likely be bad. They likely don't have immunity to all the diseases that we do. It could prove devasting.
We can send robots with video screens, to mention one of the many solutions for that well known issue.
Let them make the decision for themselves. Stop trying to control other people. Their decisions aren't negatively impacting you so you have no moral justification for taking control of their lives.
I wrote nothing about controlling people. Only communicating with them, so they can make informed decisions about what level of contact they want.