I understand this but it is a wrong option in your theme that you usually do not find in other paid themes.
The global option must be on defoult in the post and not around the topic because everyone uses various plugins (bbPress and BuddyPress to name just two) and if you have a site with hundreds of articles can not turn off the option globally and then go and to manually activate in all hundreds of articles.
I for example, on my site I have more than 500 posts and I can not go to open one at a time to turn the image out.