Reasons for disagreements are many. Research and education can provide facts to help knowledge and understanding. But differing , and sometimes conflicting, goals and values held by different people and groups are another matter.
Kaldor, Donald R.
"Why Don't We Agree on Farm Policy?,"
Iowa Farm Science: Vol. 15
, Article 5.
Available at: http://lib.dr.iastate.edu/farmscience/vol15/iss9/5