Every politician when speaking for getting vote forget about themselves, ignore all norms of human behaviour and shout through their hats and thus invite serious problems for themselves as well as for their party.
Sonia calling Modi 'merchant of death' is an exaggeration and his reply is even worse. One thing is clear- that it is only hatred that makes every one speak out. No one cares for substance, or facts. Political leaders must make sure that they speak with in certain norms acceptable to human beings. Speaking emotionally is dangerous and these outpourings can hurt the feelings of many. Hence our politicians must conduct themselves in a manner acceptable to the society. Attack economic policies, project better alternatives but not hit below the belt.
P.M.G.Pillai