So explain all those leftist movements that ended up creating dictatorships like the Soviet Union and the PRC.

It’s a problem of reliability. If you need to be at work at 08:00 and your train is regularly late or getting cancelled, you can’t take the train to work.

No. Parents who starve their children should, but the vast majority of vegan parents don’t. It’s completely possible to feed a child a vegan diet that meets their nutritional requirements.