The problem with that is a person might block someone they want to speak ill of. The person maligned wouldn't know it if they were blocked. So the insult, lies, whatever would hang out there for everyone to see except the person most in the position to refute it (or sue them for libel).
On that basis I guess it wouldn't be a good idea to let us toggle ourselves from certain people.
I've been observing the effect of something recently implemented that I wasn't aware of. I was curious about the notable absence of a certain troll so I did a search to see if he'd been on lately. His posts still come up in a search on his name, but if you click through to the thread in question, all his posts are hidden. The only way you can read what he said about anything is if someone happened to quote him. The posts are hidden, not deleted, but there is no placeholder saying "post hidden" as with a toggled member or any other clue that there was something there that other people are responding to.
This is a kind of "self-toggle" but it was done by Jacob or the mods. The effect is what would happen if someone toggled themselves from everyone in the forum. It's a very bizarre effect. Since there is no explanation within the thread that a certain poster's posts are no longer visible, any newbie who was searching on the topic of the thread would read through that and wonder if we'd all lost our minds because the thread no longer makes any sense. In one case, the troll started the thread with a misleading title. I was the first responder to his post which makes it look like *I* was the one who started the thread since the OP is not there any more.
I ran onto another "former member" (who may be here under a new alias) who went back and deleted the content of most of her posts going back months, replacing it with comments "deleted for ....(fill in the blank for some lame reason)."
The archives are now blocked from additional posts; I wonder if maybe those old threads shouldn't just be deleted. There's not a lot that's over a year old that can truly be considered relevant any more, with all the mergers and changes in who shops whom, and guidelines changes. If a thread isn't stickied and hasn't had activity in a year, maybe it's no longer useful and it could be counter productive to keep it in the archives, especially once it has been modified by the removal of posts.
Time to build a bigger bridge.