Need help to explicate this poem

0 Hi Everyone!!! 02br
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00I need help in finding the theme/poetic techniques of this poem 02br
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00WOODCHUCKS by Maxine Kumin 02br
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00Gassing the woodchucks didn't turn out right. 02br
00The knockout bomb from the Feed and Grain Exchange 02br
00was featured as merciful, quick at the bone 02br
00and the case we had against them was airtight, 02br
00both exits shoehorned shut with puddingstone, 02br
00but they had a sub-sub-basement out of range. 02br
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00Next morning they turned up again, no worse 02br
00for the cyanide than we for our cigarettes 02br
00and state-store Scotch, all of us up to scratch. 02br
00They brought down the marigolds as a matter of course 02br
00and then took over the vegetable patch 02br
00nipping the broccoli shoots, beheading the carrots. 02br
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00The food from our mouths, I said, righteously thrilling 02br
00to the feel of the .22, the bullets' neat noses. 02br
00I, a lapsed pacifist fallen from grace 02br
00puffed with Darwinian pieties for killing, 02br
00now drew a bead on the little woodchuck's face. 02br
00He died down in the everbearing roses. 02br
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00Ten minutes later I dropped the mother. She 02br
00flipflopped in the air and fell, her needle teeth 02br
00still hooked in a leaf of early Swiss chard. 02br
00Another baby next. O one-two-three 02br
00the murderer inside me rose up hard, 02br
00the hawkeye killer came on stage forthwith. 02br
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00There's one chuck left. Old wily fellow, he keeps 02br
00me cocked and ready day after day after day. 02br
00All night I hunt his humped-up form. I dream 02br
00I sight along the barrel in my sleep. 02br
00If only they'd all consented to die unseen 02br
00gassed underground the quiet Nazi way. 02br
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00Thanks 0-