These are the people who will try to convince you that the only problem with liberalism is that there are people who have pushed it too far.
The reader went on to argue that liberalism will always gravitate to extremes:
There is no such thing as moderate liberalism, or moderate feminism. Once you accept a mild version of these ideologies you will end up with the extreme version. Every single time. The very nature of these ideologies is that they are Utopian. They just have to keep pushing until Utopia is achieved. Once set in motion they cannot be stopped.
I think this is right. The way liberalism tends to work is that one generation takes it so far and then thinks that it has gone far enough. But their children grow up with the new liberal ways and notice that there are things that still don't fit in with a liberal concept of justice. So they push society further along the liberal path until they think things have gone far enough...and so on.
Liberalism will keep traveling in a certain direction, along a certain path, without stopping, because there is no brake built into it. Even if you managed to take it back a decade or so, it would come back again in much the same way.
If you are a liberal, and you want to maximise individual autonomy, you do so by opposing all the things that place limits on what an individual can choose to become or to do. This includes whatever is predetermined that influences our choices, such as an assertion of a binding moral code, or the sex or race we are born to, or even the nationality we inherit. For as long as these things matter (i.e. influence us in some way) there is, for a liberal, a social injustice to overcome.
Furthermore, if autonomy is the source of our human dignity, then it has to be accorded to everyone equally, otherwise we deny the human dignity of others. So if it can be shown that any one group, on the basis of predetermined qualities, suffers a disparity in any life outcome, then that too is for liberals a social justice that has to be overcome.
Which makes the liberal program a radical one from the outset, even if it is implemented gradually over time. And there is no way to draw a line in the sand beyond which liberalism will not venture, because that, for liberals, would mean allowing a "social injustice" to continue.
This means not only that liberals are willing to commit to major transgressions (erasing traditional nations, deconstructing the family, making our sex a personal choice rather than a biological reality), they will also seek out minor transgressions as well (e.g. getting upset if a boy plays with a truck and a girl with a doll).
It is all made worse by the belief that many liberals have that they are "immanentising the eschaton." These liberals believe that there is an end point to humanity, an end of history, when liberal social justice will reign, and the purpose and meaning of humanity will finally be realised. There are liberals who construct a quasi-religious sense of meaning and purpose from this, so it is very difficult for them to abandon this vision of an arc of progress of humanity toward its ultimate fulfilment, by saying "we have taken these principles far enough, they are now doing harm." If they were to acknowledge such a thing, the sense of purpose they have hung onto would collapse. It's not possible for these liberals to acknowledge the possibility that liberalism, taken too far, might do harm, as liberalism is supposed to take humanity right to its very end point. There can be no "too far".
All of which means that there cannot be an escape from liberal excesses. The liberalism we have is the liberalism we were always going to get.
Which means that there is no avoiding the political task of going back and rethinking the first principles on which our societies operate. We can do better, much better, than the liberal assertion that "freedom as autonomy" is the sole, overriding good. There are many goods to be upheld within a human community, and the task is to order them so that they fit together as well as can be managed.