Emor Bulletin in PDF format

If a person is faced with a choice–he is up to tachanun, and the tzibbur is about to say aleinu (one is supposed to join in with the tzibbur to say aleinu), it is more important for him to say tachanun immediately following shemoneh esrei than to say aleinu with the tzibbur.

The problem with a Kohen having a physical defect, says the Chinuch, is that other people’s kavana and concentration are disturbed by the sight of the less-than-whole person. We should similarly realize that our behavior in Shul, even if we can live with it, may very well be a disturbance to others.