Yes, and then the next jury ignores the law and evidence and convicts someone because they're black and their victim was white. Allowing emotion to trump law and evidence cuts both ways.
We're better off reforming the system to improve our laws.
We can and have always been able to reform our laws. Law are made by men, sometimes frail and venal men and sometimes they are applied by just these same men out of cunning and greed. There is no safety from the abuse of power except that the truth is unalienable and can be perceived only by the individual. Very wise and sophisticated men realized this long ago, in my opinion, and provided for jury nullification with just this fact in mind, that the highest conscious a person can have is to the truth of a single person's human nature. You fear jury nullification because you do not know this internal truth via self revelation and are suspicious of man's true nature. You will never reform the system without folk who are consciously aware of their true human nature, so I would recommend that you focus your attention on how to foster an enlightened citizenry first, before you go too far down the road of reformation.
I believe that you are intellectually too attached to a theoretical understanding of law when even monkeys understand justice by feel. I refer to experiment where they refuse to play games in which they are screwed by unfair and unequal rewards.
The day we take the unalienable fact that justice can't be codified or bottled, that it requires personal conscience and an innate will to justice, we become ants, just robotic cogs in a machine.
I will not render unto Caesar what is Caesar's because from where I stand Caesar doesn't own anything.
Jury nullification is an affirmation of the supremacy of the conscience of a single autonomous and free human being, a real life deus ex machine event that transforms things.