Whose fault was Cesar Sayoc? The media or the individual?

Link for those who forgot.

I actually forgot about this guy! Maybe COVID and a lot of life changes broke my brain I'm not sure. Anyway- in case you too forgot, he was arrested/convicted for mailing pipe bombs (in 2018, remember) to:

former Vice President Joe Biden, Sen. Cory Booker, former CIA Director John Brennan, former Director of National Intelligence James Clapper, former Secretary of State Hillary Clinton, CNN, Robert De Niro, Sen. Kamala Harris, former Attorney General Eric Holder, former President Barack Obama, George Soros, Thomas Steyer and Rep. Maxine Waters.

Everybody at the time loudly said "political violence is bad" and condemned his actions, correctly. But in light of the increasing instances of political violence against right-wing folks the conversation of "the media is complicit" and "dems need to tone down the rhetoric" is back.

Questions:

• Was that the case back then?
• Did this guy just snap or did he do this because he felt the same things that the WHCA gunman did?
• Why is he not mentioned in contemporary discussions of political violence? Just because he was unsuccessful, or because we've since crossed the proverbial Rubicon?