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It's a basic computer engineering principle not to ignore errors
silently, and no one has given any reason, good or otherwise, 
as to why this code should be in there. 

To not believe this problem could ever happen is to assume that
there are never side effects in Tcl from Tkinter.

For an example of where a bug has been obscured by this,
comment out the line self.tk.createcommand('tkerror', _tkerror)
in Tkinter.py and run Demo/tix/tixwidgets.py Click on the
ComboBox in the ExFileSelectBox demo. The popdown scrolled
list widget is being created, then destroyed. 

Martin I don't know how you could still assume
that Tkinter does *not*, actually, drop any errors
when you checked in the description of the bug
over a year ago: Demo/tix/tixwidgets/BUGS.txt
$Id: BUGS.txt,v 1.1 2001/03/21 07:42:07 loewis Exp $