Temper = mood?

Temper is used here as a transitive verb. Fears of chaos are tempering calls for change in Morocco.

http://www.answers.com/topic/temper

Meaning (1) here:

1. To modify by the addition of a moderating element; moderate: "temper its doctrinaire logic with a little practical wisdom" (Robert H. Jackson). See synonyms at moderate.

http://www.answers.com/topic/moderate

2. To bring to a desired consistency, texture, hardness, or other physical condition by or as if by blending, admixing, or kneading: temper clay; paints that had been tempered with oil.
3. To harden or strengthen (metal or glass) by application of heat or by heating and cooling.
4. To strengthen through experience or hardship; toughen: soldiers who had been tempered by combat.
5. To adjust finely; attune: a portfolio that is tempered to the investor's needs.
6. Music. To adjust (the pitch of an instrument) to a temperament.

Got it.
Thank you.

Here, "temper" means to calm down or reduce urgency.