all attempts at socialism and socialist property norms have had to be forced on people at the point of a gun.

The people were holding the guns. They forced it on the government. If you notice, what little amount there were, all anarchist revolutions were headed by the people, with the primary goal of removing state oppression, rather than changing it to a different flavour. An example is Revolutionary Catalonia, where the anarchists managed to establish a quasi-anarchist society, essentially a free territory, until the nationalists and the fascists from neighbouring regions won the war, and destroyed the society. It was a case of the people supporting themselves, versus the people supporting an authoritarian regime. And the authoritarian regime won.

We doubt that people will voluntarily choose it, and history seems to be evidence that the doubt is well founded.

Despite the fact that all libertarian socialist revolutions were not people being forced into them - they were lead by decentralised militias with the goal of liberating the most neglected people in society. The arguments people typically use here are the Vietnamese revolution, or Chinese revolution, where mass amounts of people fled, due to authoritarian socialism.

people standing in the way of the 'all' must be forced to accept it

As seen in authoritarian socialist revolutions (e.g Russian revolution), rather than libertarian socialist revolutions...