Why attacks against Muslims are termed as Islamophobia but it is not Kaffirphobia when Muslims attack others?

I believe instead of Islamophobia there should be a general resolution in the UN to discourage attacks against other faiths because there are many incidents where Muslims have attacked people of other religions or non-muslims living in a muslim country have received hate crime and death threat. Just recently in Pakistan, multiple churches were destroyed by fanatic Muslims in Jaranwala. Why shouldnt these attacks be termed as Kaffirphobia if attacks on Muslims can be termed as Islamophobia?