You're looking at the scheme more than the "victims".
If someone were to set the most despicable inhumane rat trap ever devised, you will never get me to feel sorry for the rats, because at the end of they day, they are fucking rodents. I don't care who set the trap. I'm not going to say "great job!" then learn who the creator is and say "Oh nevermind booo!!!"
Ends justify the means here. This isn't the end of "reaction content" and even if it was, oh fucking well. Maybe it's high time people started making original content instead of reacting to piggy backing off of premade works. These people aren't making parodies, they aren't even critiquing the work, they willfully and spitefully admit to reuploading the content with no other concern than making sure the original "artist" (trust me, I know I'm reaching with that term when talking about Ethan Klein) doesn't get the views on the original video.
If it was anyone other than Ethan Klein setting these lawsuits you'd be cheering him on.