In your message to me you said that "sociological foundations" refers to the idea that education is meant not just for the individual's benefit but for that of society. It means that education should include instruction on how to get along as members of society. I will answer based on this:
I would say that sociological foundations are essential because modern society and modern jobs are much more interactive than they once were. Businesses, in the US, at least, often emphasize that they need students who will be able to work well in teams, often with people of different backgrounds than themselves.
In addition, many modern societies are becoming more diverse in terms of ethnic, religious and other sorts of demographic factors. Because of this it is important for schools to help children learn to deal with this new reality. It is hard for parents to do this because they are not as able to expose their children to others who are quite different from themselves. This is much more possible in school.
Finally, sociological foundations are important for societies that wish to be democratic. When students are expected to grow up to be participating members of a democratic society, it is important for them to learn democratic ideas and habits as they grow.
In these ways, it is essential for education to prepare students to be members of society rather than just teaching them information for their own personal edification.