Hegelian-sounding aphorism of the day:
Leftism asserts the negation; liberalism negates the assertion.
Thus, the Left is communist and wants to destroy the heritage of the past. It asserts that the past must be negated. Liberals, on the other hand, are anti-anti-communist and simply deny that the heritage of the past should be asserted.
Why do leftists and liberals do that? Basically, because they don’t like existence. When something exists it excludes things, and can’t be made into something else, which seems obstinate and even aggressive. The Left therefore wants to destroy whatever exists, because existence means limits, while liberals hope whatever exists will go away if they just stop supporting it.