Why?

Behold, the grave of a wicked man,
And near it, a stern spirit.

There came a drooping maid with violets,
But the spirit grasped her arm.
'No flowers for him,' he said.
The maid wept:
'Ah, I loved him.'
But the spirit, grim and frowning:
'No flowers for him.'

Now, this is it -
If the spirit was just,
Why did the maid weep?