Well, I am seeing some validity in RaulMarrios opinion. Often here at JTF we will say that a person deserved to get Cancer because of his wickedness. If this is the case we consider Cancer to be a curse on wicked people. I take some offense at this because Cancer can strike righteous people too, as it recently took my father {pancreatic cancer} and my step-dad is now suffering with cancer. I want the medical community to find a cure for cancer even if it will save wicked people too. All the people with AIDS are not wicked, some may have contracted it when they were confused or vulnerable. If they make a honest Teshuva then why should they not be spared from this deadly disease.
Of course we rebuke the sinner who persists in his evil ways... But it is wrong to condemn all who suffer with this due to the wickedness of the majority. Remember that one of Hashems greatest qualities is that he is Long Suffering, in that he gives us a long time in order to repent. If justice was swift and decisive none of us would survive.
Muman, your logic in essence is that just because a righteous person can be afflicted with cancer, then nobody deserves cancer ever. Really, have you thought this out? So if Adolf Hitler, Sheikh Nasrallah, Heinrich Himmler, or Lady Gaga (no she didn't mastermind a genocide, but she is masterminding the murder of millions of young souls through her pornographic filth) got cancer, they would all be "victims" who deserve a cure from it?
Every human being, good or evil, dies. So, because noble people will die and have died, does that mean that a convicted serial killer must not get the death penalty because good people also experience death?
Cancer is not a curse on wicked people. I believe that is where you are missing the mark. Every illness will have a cure in Messianic days, there will be no sickness. It is also true in Messianic days there will be no evil...
The wicked will perish, this much is true... But who are you or I to say who deserves death from the Cancer? There is only one true judge in Heaven and we call his name Hashem, the L-rd, G-d of Israel. Do you know what is in a mans heart or mind? I don't. I can only judge what I see and it is not possible to see a human soul.
I pray for the recovery of all who are ill, that the sinner will see the error in his/her ways and truly repent. It is an important belief in Judaism to believe that even the most vile sin is forgivable by Hashem. I had heard that Christianity also had a lot of belief in repentance... But you are entitled to not forgive if you so desire...
For instance all during my childhood I had a great resentment and dislike for my step-father... There were times I dreamed of killing him... I regret all of those feelings now, and I hope that his cancer is cured...
PS: Regarding forgiveness... I do not forgive those who murdered my brother and I do not pray for enemies of my people. They will be taken from the world one way or another...