Earlier quoted context omitted.
One defining aspect of a free market is destruction. The other is creation. You don't get one without the other.
On the contrary, the core thesis of Wealth of Nations is that a free market in an industrial economy is not zero-sum. Creation exceeds destruction, and the former does not require the latter.
Technically yes, but there are always exceptions. Just because a well oiled and well functioning free market economy can be positive sum doesn't mean we have such an economy. Things can get really weird and backwards over the short term. The problem is that the short term can last decades and may waste a quarter of a human's life and cause irreparable damage. Therefore we should make the economy as positive sum as possible.
For example, we have in our mind that every single individual is supposed to take care of themselves. This implies that we have to contribute to society by working but full employment isn't guaranteed, there there may be a large chunk of the population that is without a job over the short term. The pandemic is a pretty good example.
A simple solution would be to just give them a temporary job, even if the job is stupid or pointless (think Keynesian gold digging). These people receive a salary and proceed to spend it on actually useful things, which will create useful jobs. By useful I just mean something someone wants, a government deciding to produce something may produce something nobody wants (see the Trabant). Those products not only need labor but also natural resources so they are twice as wasteful. Of course you can skip this whole work thing and just declare that finding a job is your job and increase unemployment benefits like Biden did.
Of course there will be some inflation but economic activity is a good thing.