It certainly wasn't genocide. Nobody outside of America thinks it was. In parts of America it is taught alongside the holocaust.....
Corn was imported once, by Peel, to relieve the situation, against incredible opposition from virtually all at Westminster. From that point on, the government did pretty much nothing other than offering relief work. Russell's government had very little interest in helping and, without question, saw mass emigration and, yes, some 'downsizing through termination' as a bonus in reducing population.
Throughout the famine they continued to export huge quantities of food but, despite this, there was still plenty available in Ireland. Unfortunately, your evicted tenant farmer couldn't afford to buy it and nobody was of a mind to give it away.
It is one of the most shameful episodes in our history but it should be taught in schools. There are some wonderful examples of individuals, charities, and well minded folk risking their lives to help.
For the record, the Quakers were the first to get over there and they remained throughout the famine, giving away food.