This answer started life as a comment on Robert's answer but grew too long (and it is itself an input into this "discussion"-tagged meta post.)
I don't quite understand how the inclusion of the word "really" can be uniformly considered as adding bias. Bias on which side?
The guide for new users explicitly states that one should express the claim (with references and exact quotes), and then "Express some doubt and ask if it is true."
If the claim is stated in the title of a posted question, the word "really" serves to express doubt about it. Likewise, the phrase "Is it true that..." asks if the claim is true.
I don't claim that "really" is a necessity to include in every question title—but my reasons for wanting it gone have only to do with the noise and clutter it adds, nothing to do with any perceived bias.
At the very least, if it is broadly agreed upon by community members that questions should not have "really" or "actually" or "is it true" in their title, then the FAQ for new users should be updated so that such redundant word inclusions in question titles aren't in direct, literal compliance with the instructions given to all new users.
Including my response to @Sklivvz's comment:
The difficulty with the bullet point "Express some doubt and ask if it is true" is not just a matter of phrasing. It's a higher-level policy point that needs to be agreed on.
Do we want people to only ask about claims that they personally doubt?
If that's what we want, we can hardly complain when they communicate "I doubt this," can we? Or do we simply want people to ask about claims that may be subject to doubt, whether theirs or another's?
Perhaps, after the first two points as written:
- Point to a statement that someone well-known has made (or a number of less well-known sources)
- Quote from it (a direct quote, not just a paraphrase)
Express some doubt and ask if it is true.
We could include a modified third point like so:
- Point out the lack of cited evidence in the claim, or express doubt about the trustworthiness of the cited authority. Ask for reliable evidence that the cited claim is either true or false.
But that's a bit wordy.