Why our human inborn nature reverts into animalistic nature and what is the real reasons?

This question inspired me to ask .. http://in.answers.yahoo.com/question/index;_ylt=AloNrIsSJ5FEKKsx_kIlyZaRHQx.;_ylv=3?qid=20100301134923AAWdIxO&show=7#profile-info-sorb72tMaa no brotherly love, no real friendly, false identifications for self satisfaction and temporary happiness, no mutual understanding, ego,... show more This question inspired me to ask .. http://in.answers.yahoo.com/question/ind...
no brotherly love, no real friendly, false identifications for self satisfaction and temporary happiness, no mutual understanding, ego, jealous, competitions, violence, sex, acting, disobedience, threatening, ''let me see you or me'' types, scolding, direct and indirect attacks, verbal abuses, etc.,Though some of them are human nature but the percentage of animal nature increases day by day, and unfortunately things have become worse. The helping nature, understanding, share, gone down and believing rumours, hearsays on increase. Hasty decisions, hasty actions without knowing the truth too increses.

our ancestors were more wise and behaved a real human but now we have seen beasts in human forms. If we are strong, clever, and have a clear understanding, we can survive. Because of these inhuman and beasts like actions we are making others to worry, and we too lost happy.

It is an inherent nature for human to revert back to our animal instincts, however proper nurturing education, we are afforded the opportunity to achieve better lives but why we are animals in some angles.?

Finally, civilization is only a thin veener over our animalistic selves. it is proven over and over to us in the daily news stories for which acting as a hindu saint Nithyananda swamiji is a good example.

please come and say your good views on reasons, how to get out of etc., thanks for reading !!!
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