Why a C-section is the first choice for twins!?

Marcela
I am having fraternal twins in about 3 weeks or less. Both my girls are head down and I had a previous vaginal delivery. My doctor is really supportive and really good with multiples birth via vaginal delivery, I know I am in good hands and I truly don't see nothing wrong with it, I see C-section as an emergency method in case things don't go as planned. But I am getting a lot of backlash with my decision of having them vaginally, I know in the US c-section it's the first choice for FTM of multiples or if both are breech. They think I am completely insane and putting my babies in danger. What is your opinion?  This made me really curious, with my first kid no one said a peep when I decided to have him naturally (I ended up needing an epidural anyway) but now, Everyone has an opinion and no one is really supportive.