prakṛteḥ kriyamāṇāni guṇaiḥ karmāṇi sarvaśaḥ ahaṅkāra-vimūḍhātmā kartāham iti manyate

"The bewildered spirit soul, under the influence of the three modes of material nature, thinks himself to be the doer of activities, which are in actuality carried out by nature." (Bg. 3.27) The laws of prakrti (nature) are very stringent. No one should think that he has the freedom to kill animals and not suffer the consequences. One cannot be safe by doing this. Narada Muni herein says that animal killing is offensive, especially when animals are given unnecessary pain. Meat-eaters and animal killers are advised not to purchase meat from the slaughterhouse. They can worship Kali once a month, kill some unimportant animal and eat it. Even by following this method, one is still an offender.