With the Government's plans to commemorate the contribution of the Royal Irish Constabulary (RIC) at a special ceremony in Dublin Castle less than two weeks away, local Minister for State, Kevin "Boxer" Moran is the latest high-profile figure who has declared his intention to boycott the event.
"The role of the RIC, and the DMP, were not merely to act as police forces, but they had a specific role to instill terror in the populace in an attempt to break the democratic will of the Irish people for independence".
He said: "I believe a commemoration should be a celebration of a person or event in history and as history tells us, the Royal Irish Constabulary were at the time the strong hand of the British state who directly opposed Irish Independence".
He said the historian, Diarmuid Ferriter, among others, has highlighted this in his writing noting that Michael Collins' uncle served in the RIC while the author Sebastian Barry had one grandfather in the British Army and another who was an Irish Republican.
The "Auxiliaries" were an auxiliary division of the RIC, made up of ex-British army officers, created from July 1920.
Those who joined the RIC special reserve were nicknamed the Black and Tans due to their distinctive uniforms, while a later group of more experienced soldiers were known as the Auxiliaries.
The Auxiliaries were better paid than Black and Tans but they also developed a reputation for carrying out violent reprisals on the civilian population in the aftermath of IRA attacks.
Speaking today, the Taoiseach said it is "regrettable" that some have chosen not to attend the event.
"There is a direct connection between the RIC, DMP and the barbarous Black and Tans and Auxiliaries. They were all young people who died violently".
The centerpiece of the Decade of Centenaries has rightly been the 1916 Rising which was commemorated with over 60 official events, including seven major State ceremonial commemorations.
Confirming the cancellation on Tuesday night, Justice Minister Charlie Flanagan said: "I know that, regrettably, this decision will be a cause of hurt and upset to many people".
He said: "I am announcing its deferral".
Sinn Féin leader Mary Lou McDonald, who was among those who had criticised the event, said the deferral was "only a step in the right direction" and called for it to be cancelled.
They said it was "something that came from justice primarily" and claimed Mr Flanagan's department was "managing this themselves to a large extent".
"The RIC and the Black and Tans were a repressive force in this country and the people of this nation do not want to commemorate or honour them".
More than 500 police and police reservists were killed during the War of Independence and its aftermath.
The motion described the event planned to be held in Dublin Castle on 17 January as "obscene". "I am calling on all public representatives in Offaly to boycott this event", stated Cllr O' Brien.