Thy publish and stand by e.g. Samantha Brick's column today which belittled rape threats. Apparently women just need to man up and get back in the kitchen.
They publish articles like this to cause outrage and drive click rates which boost their advertising revenue.
Thus not only are they airing extreme views in mass media, therefore removing a layer of critical skepticism about whether the view is legitimate, but they are also trivialising the issue itself (as a driver of income and not something that is affecting real people).
Most defences ("oh i don't read the trashy bits, or the columnists with which you take issue") don't address that selecting to ignore the damaging parts doesn't make the damnedest bit of difference to the whole.
If you love someone who is gay, and you're a DM reader, and you can look your friend in the eye and say you're ok with what Jan Moir said about Stephen Gateley... no sorry that would never happen.
I read Daily Mail articles so I know what the enemy is. People who say "meeeeeeeegh you're a DM reader because YOU READ AN ARTICLE on the website"... do i even have to explain my line of reasoning?