how can people believe nurture plays a bigger part than nature?

[Lady Like]

I believe that genetics shapes humans' looks and behavior. Genetics is the reason why women act like women, men act like men and why some people are better at maths than other. The people who believe that nurture plays a bigger role than nature are usually people with low iq's who want to defend their own miseries. The nurture people I have met have totally avoided genetics, and they have said things like: "eye color is not a product of genes, but a product of environment", "Identical twins don't have the same dna. It's impossible for two people to have the same dna" and "inbreeding is okay, since genes don't mean anything". Why is nature vs nurture discussed? Isn't it obvious that identical twins have the same dna? isn't it obvious that eye color is a product of genes? isn't it obvious that inbreeding is unhealthy? Why don't these nurture people understand that?