Observing the 2 minute silence - or not, in some cases

On a London tube train at 11am, and all activity ceases for 2 mins. A public announcement invites passengers to join in observing the silence. The station where we are stopped quietens, as does the carriage I'm in, as people pause and give 2 minutes to quiet remembrance of the sacrifice made by others during the two world wars.

Except for 2 women at one end of the carriage, who continue their conversation without a pause, apparently oblivious to the looks of annoyance they are attracting from myself and others.

I just don't understand how some people are so selfish and so oblivious of the feelings of others. And I'm annoyed with myself for not going up to them afterwards and telling them how annoying and upsetting their behaviour was. Sigh...