I can certainly relate to this situation; something I have dealt with since 2005 when I joined Ancestry.
I was going to make a post addressing how I have dealt with this problem in general but will make a shorter version of my strategy here.
First an argument can be made as to if a person being irresponsible or not if they fail to learn the universal rules. "Did anyone read any rules on genealogy before doing your tree?" Probably not and especially if you are on the Ancestry two-week trial. Lack of knowledge is not always a malice act but simply a matter of exposure and experience.
Either offer up your experience or send a link to someone else's that you feel is viable.[The Huge Genealogy Mistake We All Need to Stop Making Now (familyhistorydaily.com)]
In my case, the biggest problem was the failure of people to use a map. Remember maps change and must be used with each boundary change. The second problem was people do not read a profile and the third is they neglect to edit. I started out by sending notes to various trees to do corrections based on the previous statement. People have different learning styles; sometimes just showing a different way to view or process the facts is helpful.
Then I went on to show the proper tree or the contrast of the two different people either by creating on my tree version or finding a useful tree or offering reading material. Lol, okay this is how I wound up having over 200 Randolph trees.
I also corrected the error on other platforms. Note, I try to make most names I work on match the data on Ancestry, Family Search and Wiki Tree.
As stated in other answers, for the Wiki Tree profile you should add ===Research Notes=== and {{Conflated}}
Here is an example I am working on [Hugh Richmond Randolph (1756-abt.1843) | WikiTree FREE Family Tree]
His son [James Jackson Randolph (1782-1864) | WikiTree FREE Family Tree] is even more problematic as he is a mix of possibly 3 different people.