Granted I don't know many atheists, but the ones I do know are decent people who don't mind donating to the Salvation Army and will return a Merry Christmas greeting with a smile. Also, for all the obnoxious behaviors exhibited by, for example, the ones on DU or that Newdow character, at least they are just pains in the ass, not strapping bombs to children and the mentally disabled because we don't believe (or not believe) in what they do.
The atheists of which you speak are what I used to refer to as real atheists. Taverner and his ilk at DU are what I used to call pretend atheists. The pretend atheists really believe in God and their belief bothers them. They feel if they shut down all mention or reference to God it will soothe their minds.
It may just be because they are more vocal, but I think the pretend atheists outnumber the real atheists.
If you don't think that the loons on DU long for the death of those who do not agree with them (or believe contrary to them) I think you're wrong. They just haven't figured a way to kill us that causes no risk or labor to them. I think that's one of the reason they so often root for terrorists.