These discussions are getting quite long, so I'm posting this as a fresh answer. As @Troyen mentioned in one of the comments
A lot of the SE traffic comes from search engines,
so the key to all this that I think we all missed at some point or other is that this information is essentially for the whole world. Not just for a certain person. Not even for just the contributing community on SE. But potentially anyone from anywhere could see links to our topics in results from search engines, shared through social networking, etc.
Of course in the back of my mind I know this, but that honestly does not go through my head when creating a post or editing. So after thinking about it for a while, I realized that, yes, my post titles in question may not make sense for someone who stumbles across it from a search engine or wherever. So it is right to change them to something more appropriate that more clearly tells the content (although I don't like the current wording to them and will probably change them to something else -- no offense).
AT THE SAME TIME, we need to take this into account when editing. You're not editing for yourself, not for the poster, and not for the SE community. You're editing for the whole world. So before you change something, you need to be thinking "Is this gonna benefit anyone who reads this or just me?" I think this especially applies to non-native English speakers. If there is a typo or incorrect grammar, that's one thing. But if it's a particular saying or nuance of the English language that you're not familiar with, you probably should avoid editing it. (As an objective example) In this case, @sawa edited out the 'OK' at the beginning of my sentence because he thought it meant I was accepting something and it didn't make sense to him. I don't believe he was thinking, "This doesn't make sense to me, but maybe it's an expression that makes sense to native English speakers. Maybe I should leave it alone." It seems like he edited it to his own understanding and not to the understanding of your average English speaker. Or maybe he honestly did, I don't know.
But the point is, the scope is not just us, but the world, so we need to tune these things for any potential visitor to the site. This discussion has made me think and learn. Thanks to all who participated and I hope there are no hurt feelings anywhere.