First, welcome minega! I’m assuming that you are a Rwandan born and bred. If so, I hope you might contribute to future discussions regarding Africa or the Third World since I and most of us here will be interested in your point of view.
minega, it is likely that you have witnessed things in your country so unspeakably horrific and brutal that I can only count my blessings that I was born elsewhere, beautiful though Rwanda may be. It is entirely understandable that you might cast around for someone else to blame, if only in order to bring some semblance of understanding or explanation to something so bewilderingly appalling, especially when you see the world act with great haste in the name of arguably far less deserving causes.
I believe more could, and should, have been done in order to reduce the slaughter, even though I agree that the nature of the conflict was such that a terrible atrocity was never going to be entirely avoidable. For some UN troops to at least try to set up viable safe havens within Tutsi dominated territory might have saved a few thousand lives and given hope to the victims that the world was taking notice.
Also, in a wider scope and looking longer term, a major factor in this and almost every other civil war in Africa is the prevalence of cheap but immensely powerful small arms, most of which are manufactured and exported from here in western democracies. Were similar regulations applied to such weapons as, say, nuclear power station parts, it might encourage more Africans to turn to the ballot before the bullet in future disagreements. (Of course, the use of machetes and bare hands in the genocide was well documented, but a small-arms race between even small groups of militia is sometimes enough to kick-start all out war between two entire ethnic groups.)
However, you must also understand the reluctance of foreign nations to risk the lives of their own young men and women in an interference which, as has been pointed out, faced massive logistical problems and which might even have made a terrible situation even worse, difficult as that might be to imagine.
If a strong peace is to come to your country, it will not be from seeking people to blame, but people to forgive.