Hello Irwin,
If I disable the ACL you are refering to then no user at all in the group can accept an answer, including the post owner.
Only the owner of the question (and moderators and above) should be able to accept an answer.
I believe this is how it should work (80-90% of the time)
If you Irwin ask "what are the colors of the malayian flag?"
Someone answers "purple and burgundy"
And a third user accepts that stupid answer....
Users can VOTE on answers but only the topic owner (and moderators, ...) should be able to accept the answer of his choice.
Otherwise stupid users (and there are many) will create a mess and make good users leave your website.
Or you are creating a website where the most stupid or the most funny is rewarded...possibly yes, but no.
At least there should be an option, under the ACL setting you are talking about, to select "post owner only can accept answer"
Do you understand my point of view?