This:

  As members of the community, we're interested in ways in which tech companies can use their collective power to protect privacy, rule of law, freedom of expression, and other fundamental American rights

And this:

  We also believe tech companies have an opportunity and an obligation to reduce the polarization we've helped create.

are not really compatible. People from Red America already aren't welcome in tech (I am from Red America). This makes polarization worse by creating yet another filter bubble. Making tech companies into even more explicit vehicles for progressive activism might be a good thing on balance, but it won't help with polarization. Pick one.