What are you talking about? You’re treading close to offending a good number of people on this site.
Partition was a stop-gap measure by the British to avoid the entire island being Irish-ruled, in hopes the British could either reclaim the entire island at some time, and/or have all Ireland in the same status as Canada or elsewhere in its then-empire. The ethnic cleansing you’re apparently recommending was tried with Cromwell and wasn’t about to be repeated in the 1920’s. Even so, what became the Republic of Ireland was something like 97% Catholic at partition, but what Britain held didn’t have the same kind of ratio in reverse, nor could it have. The rioting now is related to the view you seem to be expressing here.
At the start of the establishment of N. Ireland and for many decades after there was about a 2-1 ratio of Protestants to Catholics in N. Ireland. But with the subsequent higher Catholic birth rate, the ratio is now approaching fifty-fifty.
Where ethnic cleansing is carried out, and borders established, there is a solid chance for peace. Where some misguided notion of multiculturalism exists, strife is inevitable.
Sure, there is short term pain for the first generation, but in 60 years, all that is left is nostalgia.