Advertisers object to Google and Facebook content

According to the Wall St Journal, HSBC Holdings and L'Oreal reduced spending with Google because Google was serving their ads on controversial websites, or worse, on U-tube videos made by terrorist groups such as Islamic State and a violent pro-Nazi group.  This made the Journal's front page.  Google promises to move the ads away from the objectionable content.  But Pivotal Research Group stock guru
Brian Wieser has downgraded Google stock from buy to hold.
   Question for Google:  Why are you allowing posts so raunchy, and from crazy extremist groups, on your platform at all?  No newspaper or commercial radio or TV station would carry slime like this, why should Google?  If it's offending advertisers, it's gotta be really bad.  Advertisers are happy to snuggle up to all sorts of repulsive things and people if only it gets their ads out.  The stuff has to be really bad before advertisers care.
   All those "self radicalized" terrorists, (Pulse nightclub shooter in Miami, Nidal Hassan, and plenty more) claim they joined ISIS or Al Quada and went on to real terrorism after watching extremist rants and videos on the internet.  Google should not be aiding and abetting Islamist terrorists.