US: Man first shoots mother, 20 kids at a Connecticut school, then kills himself

US: Man first shoots mother, 20 kids at a Connecticut school, then kills himself.

US President cry at the brutal attack,people on the Earth also join with Mr.Obama on this sad news.

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this can may be viewed and investigated in connection with on the matters of Sex and Love.
His mother might have objected his Love or His mother might have had a companion with whom he may be angry. 

huge stress might have pressured this fellow to indulge in this brutal act,so that he could not think about small kids who do not know anything about this world/innocents..

but why Such type of shootings happens at US OFTEN,AND HOW TO ARREST IT ONCE FOR ALL HAS TO BE ARRIVED.
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How this criminal got two gun,from where it was obtained, how it was obtained by the criminal,and how he got trained to operate Two guns at a time in a row, does he got trained from any army man?.What about License particulars?

. SIMILAR TO THIS IN INDIA MANY  Women Agents IN CBI IS A MUST,SO THAT CBI WILL WORK FOR Justice AND NOT TO FAVOR ANY POLITICIAN!.

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thanks.