The quality of the information on Wikitree varies with the volunteers who entered the information. The Wikitree Honor Code requires that sources be cited for the information entered and that we strive for accuracy.
Some people take their commitment very seriously. Others -- not so much.
For the information that you have not entered yourself, I suggest you look at the profile and check the sources. See if the information and its supporting documentation holds up under scrutiny. If the profile is a person in your line, perhaps you can research and add supporting documentation -- or find information that exposes errors in what has been posted. (If that's the case, another Honor Code point is to collaborate with others, and to be polite.)
If you see only names and dates and no indication of where the information comes from, it is not a well supported profile, and I would think of the information on that profile as possibly true, but quite possibly NOT true.