"having all their property expropriated and being forced to work on collectives" is also not a principle of communism. Forced labor is not a communist value.
In simple terms, capitalist farmers produce a surplus, kibbutz farmers produce a deficit. Kibbutzen operate within a market economy and have all the resources of it that are available to the capitalist farmer - they still can't make a go of it.
> not a principle of communism.
Collective ownership of the means of production means confiscating it.
> Forced labor
When the collective decides that certain work must be done, and with no market forces, that means assigning people to the jobs. I.e. forced labor.
If you wanted to say that there are major fundamental problems with having no markets, I'd agree completely. Communism is not a set of ideas necessarily anti-market.
https://en.wikipedia.org/wiki/Market_socialism
Or, to be pragmatic, if we agreed for this exchange that "communism" meant precisely an economic structure without markets, then I'd agree that's simply unworkable. All of my points in this thread rely on my assumption that the term "communism" refers to a wider scope of ideas and models, some of which have some merit but which nobody ever should dogmatically advocate (nor should they dogmatically reject as being synonymous with Lenin/Stalin/Mao).
..simply do not produce enough to sustain themselves. Capitalist farmers do, with a surplus they sell. All such voluntary collectives have collapsed (unless they get subsidies from the government).
> have nothing to do with mass slaughter
I strongly suggest reading "The Black Book of Communism". Every advocate of communism needs to read it, if only to prepare an answer.
You're right that nothing in the principles of communism suggest mass slaughter. But those who try to implement it time and again resort to it. The reason is fairly straightforward - people resist having all their property expropriated and being forced to work on collectives. The response is to kill them.
Again and again.