A christian must not rejoice at fall of any man even their enemy.

there not be reprisal in any form

there must be constant prayer for those who go against humanity.

For those who do these things are not Christian but claim to be.

Even when it is done unconsciosly, should be remorse; that is how you, not anyone will know that u are a Christian.

[b]"WHEN ONE TOLD ME, SAYING BEHOLD, SAUL IS DEAD, THINKING TO HAVE BROUGHT GOOD TIDINGS, I TOOK HOLD OF HIM, AND SLEW HIM IN ZIKLAG WHO THOUGHT I WOULD HAVE GIVEN HIM A REWARD FOR HIS TIDINs" 2SAM.4:10

I hope as a Christian you must have known the story of David and Saul.
critisizm is allowed

Okay, all Christians should read this and beware, though this is usually preached in church.