Hi Garry! I was looking through your more recent activity and noticed you were leaving some profile messages - in general I find them to be less visible than the G2G forums, which may be why nobody is responding (though it is usually the correct place to put them unless you have a question.) I don't particularly see any G2G posts asking for help from anyone, though? Just this one.
I don't particularly think that nobody cares. It could just be that nobody had seen your messages, or there are no descendants of those people on Wikitree in general or active on Wikitree right now. I find Wikitreers to be very helpful if they can help with the situation. However, some things sometimes get lost in the crowd of information present.
The important part is to not give up. You never know when people will come your way to help you out!
Specifically in the case of James Stewart: do you know any other descendants of him, especially genealogists, who could fill in information? Maybe 2nd cousins or farther out? He is the one who you are actively looking for information on - I have no idea what to do when people are unresponsive to a merge (like for William Hewes!)