As that article says, clapping to pay respect for a dead person began at
football grounds.
As the newspaper article referenced [4] by that article says, applause
is claimed by its supporters to be "a legitimate and respectful way of
praising the achievements of the deceased"; "besides, they say, it is a
positive act expressing positive feelings".
Another practical reason for applause rather than silence at a football
ground is that "It needs only one strident voice of interruption to
break the spell. It happens often. The culprit has had a drink, or
supports a team unfriendly to the one holding the tribute, or is simply
a yob. Whatever the reasons, he has the capacity to spoil and destroy
the solemnity of the event".
At a football ground the spectators are there primarily to watch a
football match. Individual spectators have not chosen to be there
specifically to pay respects to a dead person.
[4]
http://www.guardian.co.uk/commentisfree/2007/sep/12/comment.comment2
--
Peter Duncanson, UK
(in alt.usage.english)