Largely, this is about the way words, terms and labels mean different things to different people and get mixed up in interpretation. On the most basic level, the term 'liberal' means something very different in common American parlance from what it does in the classical British or European sense - complicated by how the American version has worked its way into our consciousness and practice on this side of the pond.
In America, being 'liberal' is largely interchangeable with being 'progressive', which is an historical term that aligns us with a version of historical progress, so that our politics are part of a general progression of life from not-so-good to a lot better. That seems fine and good, except that it claims knowledge of this progression. There is a form of absolute knowledge at work here, since it assumes we know where we've come from, where we are, and where we're going - and that where we're going is a good thing. Anyone who gets in the way of this progression is therefore ignorant, irrational and going against history and all that is right in the world. Their wrongness is not a simple judgement call, but an absolute judgement, based on knowledge - of the 'facts', 'the evidence' or 'expert opinion' you might say.
This way of thinking and being is antagonistic to classical liberal conceptions of freedom and tolerance and scepticism. After all, why should we allow people to speak and act in ways that obstruct the rational and righteous progression of history? If we know, fundamentally, surely they must be stopped and prevented? Tolerance stops here, for to tolerate wrongness like this would mean tolerating the intolerable. Freedom stops here, since having wrong opinions is obstructing the freedom of people to live in that better world we know is coming.
This way of thinking is endemic in our public life and has been for some time. One of Stalin's monikers was 'Leader of Progressive Mankind', but seemingly everyone in the mainstream of politics is progressive nowadays. The way our elites talk about free markets, economic growth and globalisation is steeped in the language of progress - though there is never any utopia over the horizon as there was in the original Marxist version. It's just the habit we are in and that almost all our institutions are integrated into.
In musing upon such things, the conservative philosopher Michael Oakeshott said back in the day that, "What may now be meant by the word 'liberal' is anyone's guess."
He saw so-called liberals enforcing a world - their world - upon the rest of the world through forms of rationalism that claimed to know and know best. Nothing much has changed in that respect.
Liberalism certainly has its problems and issues, not least how it can be led astray like this. But I tend to prefer the version expressed by the philosopher Bertrand Russell here:
“The essence of the Liberal outlook lies not in what opinions are held, but in how they are held: instead of being held dogmatically, they are held tentatively, and with a consciousness that new evidence may at any moment lead to their abandonment.”
Needless to say, Russell's conception is a world away from the liberalism that people are defending and attacking in the wake of Brexit and Trump's victory. Being liberal is not about holding back from dogmatism now, it is about being dogmatic - and attacking those who do not share the same dogmatism. It is not about being cautious with knowledge, it is about claiming absolute knowledge of the state we've come from, the state we're in and the state that will come. In this sense, liberalism has become its opposite.
Certainly, liberalism in its classical sense is much too limited to provide us with absolute guidance about what we should do in our personal lives or in political life - and neither should we expect it to. But it should at least guide us towards avoiding absolutism, towards respecting the views of others who disagree with us, towards tolerance and understanding the limits of our own understanding - towards humility.
That is why I still count myself as a liberal and as someone of the liberal-left. I am liberal as well as of the left. This may be a very different liberal-left to the form that has been dominant in our public life and that is now getting a kicking, but I won't be giving up this version of liberalism any time soon.