We don't. Because we don't care about your idealist property laws. If that guy is so great he'll do just as well without his massive wealth.
lmao
Have you read any Marx? It's all about changing modes of production. It can't just start anywhere, you need a developed capitalist infrastructure for communism to work, followed by a revolutionary period where the production is mobilized under the control of the working class. This is all in the Communist Manifesto.
Because animals lack subjectivity, ethics, language, and our intelligence. These point to the fact that you can not have a reciprocal relationship with them as you have with fellow human beings. (Not to mention the fact that you biologically rely on them for sustenance.)