In no way can the genocide be compared to the attacks on the Hutu-refugees.
Human Rights Watch published this report:
Establishing a reliable toll of those killed in the genocide and its aftermath is important to counter denials, exaggerations, and lies. The necessary data have not been gathered but speculation about death tolls continues anyway, usually informed more by emotion than by fact. (...)
A U.N. expert evaluating population loss in Rwanda estimated that 800,000 Rwandans had died between April and July 1994, but this figure included those who had died from causes other than the genocide. Seltzer estimated the number of persons killed in the genocide as at least one half million. Professor Gérard Prunier estimated that 130,000 Tutsi were alive in July, but his figures did not include those in Zaire or Tanzania, perhaps another 20,000. If this number of 150,000 survivors is subtracted from an estimated population of 657,000 Tutsi, this leaves 507,000 Tutsi killed, close to Seltzer’s minimum assessment, and representing the annihilation of about 77 percent of the population registered as Tutsi. Using other data from Butare prefecture, our researchers computed an estimated loss of 75 percent of the Tutsi population in that prefecture. Based onthese preliminary data, we would conclude that at least half a million persons were killed in the genocide, a loss that represented about three quarters of the Tutsi population of Rwanda. (...)
Estimates of persons killed at any one site vary widely, often by a factor of ten or more, perhaps because most have been made by untrained observers. At the parish of Rukara, for example, estimates ranged from 500 to 5,000. In 1995, a Rwandan government commission set the death toll at the Murambi Technical School in Gikongoro at some 20,000, a figure which some have since raised to 70,000, although the bodies exhumed there at the time of the 1996 commemoration of the genocide numbered in the range of 5,000. As many as 50,000 have been said to have perished at Bisesero, but a recent list of persons killed at that site totaled just over 5100 names. Similarly, some claim that 35,000 were slain in the Nyamata church, which appears to have a capacity of some 3,000.