The way it currently is, there is not a check and balance in the system and it has allowed one side to gain a lot more power which is a bad thing. While those on that side feel they are on the "right" side, that power imbalance has corrupted that side like any form of absolute power tends to do.
Giving the platforms still more reasons to ban people they deem liabilities? Not sure what your argument is.
There are laws that the phone company can't discriminate who can use their service. Is that unconstitutional too?
People have had very broad interpretations for what constitutes corporate first amendment protections recently.
Here's a current Supreme Court justice making that argument:
https://www.supremecourt.gov/orders/courtorders/040521zor_32...
“Even if digital platforms are not close enough to common carriers, legislatures might still be able to treat digital platforms like places of public accommodation. Although definitions between jurisdictions vary, a company ordinarily is a place of public accommodation if it provides ‘lodging, food, entertainment, or other services to the public … in general ... Twitter and other digital platforms bear resemblance to that definition.” -- Clarence Thomas
Even if you were to agree with his opinion in full, you'd still find these state laws to be in violation, since they would be preempted by §230 in federal law, and the Constitution affirms that federal law supersedes state law wherever the two conflict.