I don't think it's quite a straight forward as that. Many Catholics were denied the vote and discrimination against them in jobs and housing was widespread:
BBC History
"In 1963, the prime minister of Northern Ireland, Viscount Brookeborough, stepped down after 20 years in office.
"His extraordinarily long tenure was a product of the Ulster Unionist domination of politics in the north since partition in 1921...
"By contrast, the Catholic minority had been politically marginalised. This was largely a product of Northern Ireland's two-thirds Protestant majority, but was exacerbated by the drawing of local government electoral boundaries to favour unionist candidates, even in predominantly Catholic areas like Derry.
"Additionally, the right to vote in local government elections was restricted to ratepayers - again favouring Protestants - with those holding or renting properties in more than one ward receiving more than one vote, up to a maximum of six.
"This bias was preserved by unequal allocation of council houses to Protestant families. Catholic areas also received less government investment than their Protestant neighbours.
"Police harassment, exclusion from public service appointments and other forms of discrimination were factors of daily life ......"
BBC News 2003
"Rogue elements within the police and army in Northern Ireland helped loyalist paramilitaries to murder Catholics in the late 1980s, the UK's most senior police officer has said.
"The Metropolitan Police Commissioner's report into collusion between the security forces and loyalist paramilitaries also found that military intelligence in Northern Ireland helped to prolong the Troubles.
"Sir John Stevens said informants and agents "were allowed to operate without effective control and to participate in terrorist crimes".
"The latest report, called Stevens Three, found that members of the RUC and Army colluded with the largest loyalist paramilitary group, the Ulster Defence Association (UDA), to murder Catholics."