I believe that the Press is required to use that qualifier when reporting on someone who hasn't been convicted.
But, as we all know, just because someone hasn't been convicted doesn't mean that they're not guilty.
The use of ALLEGE is not a requirement for newspapers, as is commonly believed. It means that something has been charged or claimsed without evidence or a final legal determination.
There is nothing stopping a newspaper from saying “the accused pervert,” or even drawing a reasonable conclusion, as long as there is no knowing of an untruth with intent to defame.
Many papers use “allege” in an attempt to “play it safe,” although even then they are not completely shielded from lawsuits, if they are not careful with the facts as they report them.
Many writers and writing instructors consider “allege” to be overused, and a sign or unimaginative and sloppy writing. For an example (with an amusing case), see:
http://www.newscript.com/allege.html
I've noticed that reporters (news readers) often use it even when speaking of someone who's been convicted. They don't even realize what they are saying.