Why are world leaders backing this brutal attack against Kurdish Afrin?

Why are world leaders backing this brutal attack against Kurdish Afrin?

Islamist militants – with Turkish army support – are wreaking havoc with a pocket of peace and sanity in the Syrian war

https://www.theguardian.com/commentisfree/2018/feb/23/world-leaders-brutal-attack-kurdish-afrin-turkish-army
https://www.theguardian.com/commentisfree/2018/feb/23/world-leaders-brutal-attack-kurdish-afrin-turkish-army