Anonymity protects lots of different kinds of commentary and discourse on the internet. I'm surprised you're so cavalier about it. My understanding is that this was posted by a sub reddit for like-minded shitheads and that this would not have been seen by anyone if Trump hadn't retweeted it.
I'm surprised how many people think so little of the value of anonymity -- not just in this case, but in general. Without the ability to put forth speech anonymously, the country the way we know it likely would not even exist. Lest we forget, Alexander Hamilton, John Jay and James Madison published the Federalist Papers under the pseudonym "Publius". Just like the price of freedom of speech is that we have to tolerate hateful groups like the KKK having the right to spew garbage, there is a cost to free speech and anonymity: trolls can spew forth crap without recrimination.
Free speech doesn't just need to be protected from government (first amendment), a lot of very valuable speech is sometimes not popular and needs protected. The medium has evolved, but publishing anonymous speech on the internet is no different than publishing a flyer or papers anonymously. Without the ability to publish thoughts and information anonymously, free speech will essentially get reduced by mob mentality to only include speech that is popular. Who is going to say anything that is unpopular if it results in them losing their jobs or even getting killed? No anonymity pretty much means free speech is dead.
You called this a tactic for "countering offensive speech" but my understanding is that other trolls have already responded to CNN with more threats, so how exactly did this do any good?
Suppressing or silencing offensive speech isn't a good counter -- more free speech is. Obviously this tactic by CNN won't do a damned thing to stop or reduce offensive speech, in fact it will spur more of it and even paint those who spew this kind of garbage in a favorable light when some mega-corporation goes after them. The guy didn't do anything illegal or even distasteful with the WWE / CNN logo thing. He did something to try to be humorous. The president retweeting seems beneath the position of the president, but that doesn't change anything about what this guy did. The fact that he published other vile crap doesn't change anything, the principle remains the same. CNN is completely in the wrong on this, and now they are going to get a whole lot more problems than they bargained for.
I already said that based on what I've seen, he's a complete piece of shit, why do I need to read his presumably hateful, vile, racist, posts? The ADL is a shitty organization and I'm not going to their website.
The ADL is a lot like the ACLU. Sometimes good, sometimes very necessary, but also often rotten and political.