Keshav has the right idea here - it is usually inappropriate to edit other user's posts to add, remove, or alter honorifics.
The only time I would edit a user's honorifics is if they were annoyingly inconsistent (and then too, only as part of a larger improvement to a post). For example, suppose a hypothetical user has posted the following:
y does lord shiva have a 3ird eye? where can i learn more about shivas eyes?
I would probably edit it to something like this:
Why does Lord Shiva have a third eye? Where can I learn more about Lord Shiva's eyes?
This is roughly in keeping with the idea behind Please use consistent spelling in your posts - in this case, what I'm basically saying is "please use consistent forms of address in your posts (unless you have a good reason not to".
I disagree with Keshav's position in the comments on his answer, in that I don't think it is a good idea to create a list of approved honorifics or anything like that. This is likely to engender a problem: how do we decide which honorifics go on the list? Can we reasonably do that without offending someone or the other? I think that we could solve this problem if we put enough thought into it, but I don't think that we would get enough benefit out of creating a list of approved honorifics to make it worthwhile.