I think part of the problem is that a lot of 
people, especially Americans, think they aren't 
doing anything wrong. They may even think they're 
being respectful and just don't get that some 
other cultures actually find 
appropriating "Ethnic" names to be offensive to 
that culture. I've spent a lot of years on 
various Native American Reservations here in the 
States and have seen a lot of Non-N.A's taking on 
N.A. names such as "White Feather" for example. 
Mostly they really just trying to get into the 
whole cultural experience and have no clue that 
most tribes find this presumptous and offensive. 
That could very well be the case with the people 
deciding they must simply have "Japanese" names 
if they're going to collect cels and don't 
understand this can be confusing and might even 
cause offense.