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All but the most sociopathic or self-destructive of atheists realize that the reason that one doesn't do evil shit or screw w/ other people is because it makes you unpopular and despised and feared.
Do that sort of thing enough times and there tends to be a comeuppance - not a cosmic or religious one - a real world real time comeuppance of jail time or beatings or death by the people you've done evil too or their agents.
Lovemaking and laughter and happy children and fuzzy kittens and so on are all tangible real world bits of "heaven" that exist right here on Earth right now. One can be happy and fulfilled and moral with their years here on Earth - without having to be threatened by invisible beings.
Sure an eternity of hangining out and having a great old time w/ all of my dead friends, relatives and pets in some afterlife is an appealing thought - but it seems sort of unlikely. If it happens - great, but I'm not going to let some invisible being or his agent tell me that I have to wear a special hat or not eat pork or tell my daughter that her menstrual cycle makes her disgusting or that I should hate that guy over there or I have to kneel x number of times a day and face that way or talk to a tree and so on and so forth.
And if I don't do all of the above then I won't get to see may family in the afterlife or maybe I'll burn in hell or I'll cease to be or blah blah blah.
I'm a nice guy now, without the cosmic threats or fear. If I have doubts or fears about how my life is going I figure it for myself or rely on my friends and family. Don't need the almighty space man to sort things out for me.