A Robber's Apologia

Dusk has arrived,
Cover for my game;
Vehemence is swifter,
It will be tonight.
Pa goes drinking,
Ma will be asleep;
Siblings are hampered,
The dark woos.
Purpose denies malice,
Earth is not my foe;
She toughened my resolve,
Gave me weapons too.
I must survive,
So too my kin;
We have no fault,
Save to be poor.