Is there a need for teachers to teach social skills in the classroom?

Year after year, day after day we see the same students going in and out of the principles room with the never ending behavior problems. These students fill out problem solving sheets and do their time and are back in class doing the same behaviors they were sent out for in the first place. What are we as educators doing to help these students with these never ending behavior problems? We see these problems because of the students lack of social skills but are they teaching social skills in many of the general education program as part of the curriculum? At our school there are a few teachers that take the time to address and teach social skills but not very many. Those teachers that do not take the time are the teachers that are sending students out to the office.
I teach social skills everyday for 60 minutes in my Emotional/Behavioral Disorder Special Education Classroom. I follow a scope and sequence starting with manners ending with bulling and anger management. I have found that the Social Star curriculum is very helpful when I write my lessons. I have really seen a big change in the behavior of my boys once we completed a section of the scope and sequence.

How do other teacher handle lack of social skills in their classroom?
Do you feel there is a need to teach social skills in General Education as well as Special Education?