Not wanting children is not evil. Having children that are not really wanted is way more evil. You are guaranteeing future criminals, crack heads, etc.
As for children being annoying, obnoxious, etc., this comes down to the parents themselves.
Finances are a strong consideration but, as much as this might sound kind of liberal, quality time is much more important.
I have two teenage children who I would be more than willing to die or kill for. They turned out to be great kids. One will be going to college next year and the scholarship offers are rolling in. Neither one has ever been in any kind of trouble. I have messed up a lot of things in my life but I believe that this is the one thing I have done right.
This, by the way, living in New York City on a civil servant salary. Also, still with my wife after 19 years.
If you truly do not want children because you do not desire the responsibilities of parenthood it is not evil to not have children, it is noble.
I know there are theological arguments here but I base my opinion solely on this world.