There are photographers employed by newspapers and there are photojournalists who are freelancers and there are paparazzi.
Probably the ethics has to do with which you choose to work as.
Newspaper photographers ethics are probably chosen for them by the editor.
As for photojournalists, sentimentality probably is not a preferable trait, because a lot of shots you take are going to hurt someone but the greater good may be served by getting the message out. Tricky ethics.
Paparazzi are bottom feeders who probably never heard of ethics. But they have a symbiotic relationship with publicists who need to get their clients picture out there. Sort of two bottom feeders working together to overwhelm the public with visual noise.