I've noticed over the years that those (such as the author of this article) who feel it necessary to run around spewing their athiest beliefs have 2 issues-
1. Most often, they really believe in God but are VERY ANGRY at God, usually due to the tragic death of a loved one, or
2. They CRAVE attention.
Most of the REAL athiests in the world just want to be left alone.
Bingo. Many of those who fancy themselves 'atheists' actually use that term as an excuse to carry out a temper tantrum against a bad experience in some church ( a repeat of your point 1 ) or as a label to live the illusion that he/she is the end all be all ( sort of a twisted solipsism - something you could add as point 3 ).
The real atheists ( very few )I know could care less about all this.
That probably explains why they don't build a lot of hospitals out of all that built-up altruism that non-belief grants them.