Co-sleeping is only a problem in the US. It has been found that parents who are properly rested and not over drugged will always wake for their child and never hurt them. In the US maternity leave is poor for women at best and unheard of for men. most of the rest of the world pays women to stay home and at least allows men to take unpaid leave for a short time. This allows for better child care at a young age when those things are important.
Co-sleeping and anti-vaxer is not even close to the same thing.
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The couch thing is an issue if you leave them on a couch that isn't safe... cracks they can get stuck in. There is a lot of pictures of me sleeping on couches, beds and floors with a small child in my arms. Of course I was not drugged, never move in my sleep and I wake easily and calmly. These where also daytime naps. So an hour or two tops... not all night. Also I would never let my wife do the same things I did because she probably would have thrown one of our boys... she tends to thrash violently when she wakes up
People that breastfeed after a kid is 2 scare me. My youngest is just over 2 and he asks for certain types of food. If my son asked for a banana and a boob I am pretty sure I would upset.