Democracy involves competition among various political parties.
Their competition tends to divide any society.
If they start competing in terms of some existing social divisions, it can make social divisions into political divisions and lead to conflict, violence or even disintegration of a country.
For Example, the case of Northern Ireland that Its population is divided into two major sects of Christianity: 53 % are Protestants, while 44 % are Roman Catholics.
The Catholics were presented by Nationalist parties who demanded that Northern Ireland be unified with the Republic of Ireland, a predominantly Catholic country.
The Protestants were represented by Unionists who wanted to remain with the UK, which is predominantly protestant.
Hundreds of civilians, militants and security forces were killed in the fight between Unionists and Nationalists and between the security forces of the UK and the Nationalists.
Politics and social divisions must not be allowed to mix.
They think that it would be best if there are no social divisions in any country.
If social divisions do exist in a country, they must never be expressed in politics.
At the same time every expression of social divisions in politics does not lead to such disasters
Social divisions of one kind or another exist in most countries of the world.
Wherever they exist, these divisions are reflected in politics.
In a democracy it is only natural that political parties would talk about these divisions, make different promises to different communities, look after due representation of various communities and make policies to redress the grievances of the disadvantaged communities.
Social divisions affect voting in most countries.
People from one community tend to prefer some party more than others.
In many countries there are parties that focus only on one community.
Yet all this does not lead to disintegration of the country.