Why does justice take so long?

Why does Justice always take so long?
What's the point in punishing someone after such a long time.?
Somethings should be done on time or else they lose their relevance.
And what about the person who has suffered at the hands of crime?
Till the time he gets justice will his mind be at peace? Then if he takes it upon himself to take revenge we shouldnt say its wrong. Any person of sound mind will answer injustice by revenge. That is human nature. Any one doing otherwise has to be a saint.
And that is exactly what is happening in the case of Kasab.
How much evidence does any court need...110 people dead... isnt it enough evidence?
Then why are they taking so long to "gather Evidence"???
How much more evidence do they need?
Its already all there on Camera...Any person with eyes can see kasab carrying a gun and raoming around CST...
How long will the souls of the dead have to wait for justice? Why all this bureaucracy in a place where it is least needed? Why hasnt he been hanged or shot to death immediately after his identity was established? Till when do we keep on showing mercy who dont understand the meaning of that word?
Why... He definitely did not show any mercy when he wielded that gun on innocent people...so why should we show mercy? Some of you may think that just because the terrorists kill people. the terrorists dont deserve to be killed.That we need to tlak to them eith love and try to change their ways... but dont you think that it is very difficult to talk sense with these people... these fanatics.? Their minds have been so well toned to do all this fanatisicm that howmuchever we try, we cannot erase it. And what of the time we will spend trying to change them, During that time wont htey kill?
So is it worth taking any chances with innocent lives to change the not-so-innocent ones?
So the best way is to eliminate them... and for that we need a quick justice system.