Because they benefit from it. But at this point, it's a co-dependent relationship. Something racist gets said or done or depicted and they probably save millions a year in marketing because computer illiterate people who, honestly are not READY for the internet continue to share the content for free just to publicly express how pissed off they are about it. And it won't go away unless they STOP circulating the fucking content and putting money in those corporations pockets from ad revenue when these people circulate the content. But try explaining that to the average person who has not concept of business or economics and works for somebody else their whole life.
And when you break it down to them, they'll ignore it because they're addicted to the endorphins that come from pontificating on the internet when they rant about how fucked up OTHER people are.....meanwhile they, themselves are ENABLING and FACILITATING it because they'll share and circulate and click on every little instance of racism and/or the worst shit ever that's being distributed from a media blog or site.
It's not even personal, they're just providing the content that people will engage. It's not 100% their fault that people engage something when it's in bad taste more so than when it's something progressive. If the people who are offended were to actually evolve mentally beyond being emotional about every little FAKE thing that comes down the pike, then the media would stop putting that type of thing out there and they'd stop coming from that angle because it wouldn't get the results.
The problem isn't the just media, the problem is the interests of the PEOPLE who pay attention to the shit, wholesale and their lack of intelligence, lack of education and lack of ambition to mentally evolve from doing the same dummy stuff online and reacting to the same stimuli the same way like it's their first experience with it, every time.
When people mature enough to learn to ignore the bullshit, all the bullshit stops because these corporations are not going to spend money putting out content that's not being engaged.
Just my opinion.