Congress shall make no law /.../ abridging the freedom of speech, or of the press
And while it talks about the Congress, it is clear why the founders considered it to be necessary - the principal value of the free and unabridged speech to forming a free society is tremendous.
True, in an armed conflict, speech has been used as a weapon, and it is also true that the reality of US government has often fallen short of the noble ideals laying at its foundation. But until recently, it has been a widely recognized principle that unmediated and un-gated access to speech and expression - be it audio, printed, electronic or any other means of speech - is a vital cornerstone of a modern free society. Unfortunately, recently certain part of political and cultural establishment decided they want to "move past" these antiquated ideas of equality and appoint themselves as gatekeepers of speech - "for our common benefit and the benefit of the society", of which they are but selfless servants, to be sure.
The new Twitter CEO is, unfortunately, one of these people, and has unashamedly promoted this approach personally. Thus, we can expect only redoubling of effort from his side to suppress and remove speech that he considers "harmful" and discussion of topics he considers not up for discussion. Fortunately, there's an easy way to deal with it. As David Chappelle noted recently, "twitter is not a real place" - and doesn't need to be elevated to the position of society's gatekeeper, but rather demoted to society's cesspool. They proved themselves not up to the task to maintain robust free discourse platform - let them rot in their own bubble.