the people whose role it is to help others 这个句子是正确的吗？

是对的.
楼上的说法the people whose role is to help others也对，只是句式不一样而已。高三英语教材有类似句式：
1。Teams require leaders, and people who create ideas, who develop ideas, and whose role it is to comment and help improve plans.(P.95)
2.While governments, universities and research institutes only have a limited budget to do fieldwork, people whose hobby it is to study botany can devote a great deal of money and time to it.(P.174)

正确!
这里role是动词!
whose role it 是定语从句.修饰主语the people
主句是the people is to help others
扮演这个角色的这个人乐于助人!

不正确
应为：The people whose role is to help others.
解释：这个人的作用是帮助他人。
whose role 修饰the people

有语法上的错误
应该是The people whose role is to help others. 意思上好象也有点错误

这个句子是错的.应该为:the people whose role is to help other.

{it}貌似多于