tintinmob:
I believe this is because when the booked was first published in America
In this case I don't believe the changes
were made at the insistence of the American publisher (even though it states this in some books).
Golden Press, the first US publisher, didn't begin to issue their books until 1959, nor did they actually release
The Shooting Star.
I think it was more likely to have been some self-censorship on Hergé and Casterman's part, perhaps
in anticipation of finding an American publisher.
In any event
The Shooting Star wasn't actually issued in the US until the mid-70s.