Teacher is an honored position in any society. Teachers not only deliver knowledge and information to students, but also play a very important role in students' formation of personalities, values, and perspectives. In my opinion, considering the responsibility for teachers to be objective and factual, they should not make social or political views known to students because students are likely to just follow the opinions of them, losing their chance to think about the issues by themselves, and teachers are also social group of members who agree more to policies that would benefit themselves, which has little relevance with education.
Giving students personal social or political views of teachers would take away the students' opportunity to think about an issue deeply. Most students actually admire their teachers, just as their fathers, and they try to resemble them. If a teacher gives his or her own thoughts of controversial issues in class, students would also make their beliefs in the way that they had heard about. For example, most Korean students were taught in school that the expansion of international trading by the FTA(Free Trading Association) is not beneficial to Korea's domestic industry since it harmed the Korean beef industry. Most students now believe that the consequence of FTA is harmful only because they were taught so. However, free trading actually has developed Korea's industry in the fields of transportation, telecommunication, and Internet technology. There is no answer to the question if free trading had been beneficial or not. and the issue is still on debate. If teachers deliver their own opinions on a controversial issue, students would become more "vulnerable" to get their opinions integrated, losing their chances to think by themselves.
Mentioning personal social and political perspectives in class can not be objective because teachers, just as other social groups, favor policies that are more advantageous to them. The teacher-evaluation-system in Japan could be an example. The government in Japan has brought up an idea to evaluate the teachers to improve national education. Parents of students were very positive to this issue but the teachers were strongly against it. They argued that the system has no stable standard and it is not efficient to improve education level. This, in fact, can be seen as their opinions reflecting their pursuits of their own benefits and comfort. If students are taught that the evaluating system is not justifiable, they would only be victims who offer their teachers more comfort. Students should be offered educational service from schools, not ideas that a certain group would favor.
Taking all these into account, I would say that teachers must not deliver their own views of social or political issues. The honored position should be used in an honored way, not to take away chances from students to consider deeply on controversial issues and to search for its own benefit. The view should be kept in mind, not diffused in classrooms.