What kind of "scientist" feels "threatened" by rival scientific theories? If a scientist has done his work competently, then no rival theory will "threaten" him. Usually when you hear about something like this, what is at stake is some sort of a sinecure, and the "threat" is that of somebody having to find an honest job.
None do. This thread is over 1,700 posts long. Why not read past the title before leaping in with comments?