But Vegansrock, you would like everybody to be vegan, so the problem of how people with severe allergies would manage on a vegan diet is a real problem that needs to be addressed.
I am well aware that someone like my DiL, who has these allergies could follow a vegan diet, but it would be dull and limited because such a wide range of vegan food stuffs could not be consumed. Remember many plant milks are based on soya or nuts,
As things are because she can eat meat and dairy, she can avoid her allergens, but soya gets everywhere. The main emulsifier used in chocolate, for example, is Lecithin, derived from soya. In France we can get some chocolate that has Lecithin derived from sunflowers, but, even there it is difficult to find.
As you say becoming a vegan is a personal choice and thus it should stay, leaving other people to make their own 'ethical' decisions on what foods they choose to eat, without being castigated by those who consider their choices are morally superior