If you wish to deplatform based on broadcasting a killer's message then a lot (probably almost all) of newspapers would have to be closed.
Consider Zodiac killer's letters or Breivik's manifesto. If copycat killers arise saying they were inspired by reading their letters/manifestos in San Francisco Chronicle/BBC respectively, should these media outlets be closed and/or deplatformed?
This seems to be no different than wanting to ban/close car manufacturers for 2016 Nice truck attack in France, leaving 87 dead.
Consider Zodiac killer's letters or Breivik's manifesto. If copycat killers arise saying they were inspired by reading their letters/manifestos in San Francisco Chronicle/BBC respectively, should these media outlets be closed and/or deplatformed?
This seems to be no different than wanting to ban/close car manufacturers for 2016 Nice truck attack in France, leaving 87 dead.