The "general feeling" of us really doesn't matter.
The "general feeling" of Max, who owns the site, and of Joe, Jeff and all the volunteers who actually make it run, is what counts. And you'll find that "general feeling" expressed in various posts from Max, Joe, Jeff and others.
If it is the general feeling - is there any consensus that these methods to deal with it are proportionate?
I quote from Joe above: "The volunteers are supposed to make deletions only for the most obvious problems, and they are to report all deletions to Jeff or me. Jeff and I consult with each other." Max has explicitly delegated this authority to Jeff and Joe, and he's made his opinions clear about how Jeff and Joe are dealing with your posts.
How is this hijacking to be defined?
"on other subjects to use in your campaign against Mudcat editorial actions", "copy-pasting the same information over and over again"...