That interpretation is backwards. The "default state" of these websites would be getting sued into oblivion. 230 protected them from that, providing they act as neutral platforms. As they have continually expanded the list of content which is not allowed, whether or not they are acting as a neutral platform is being called into question.
Whenever one group accumulates too much power, that power is inevitably abused. The point of the policy is to limit the extent to which companies can control information.