“Terrorists do not wear a special uniform.. They are like other people, like other youths. They are not easy to recognize. Sometimes, finding a terrorist in the 14 million population of Tehran is like finding a needle — not in a haystack, but in 10 haystacks.”
Mahmoud Alavi, Iranian intelligence minister
The Shia and Sunni differences have are similar to the Protestant/Catholic differences of Northern Ireland. However, some Iranians take a more tolerant view of extremists. For example, Jalal Jalalisadeh, a former member of the Iranian from Kurdistan takes a stance that many around the world could emulate. Salafis are an ultra-conservative group in parts of Iran. “They were peaceful. As long as the Salafi groups are not taking arms, they must be tolerated,” ibid.
"A child killed in a bombing while eating ice cream in Baghdad is the same as child killed in a bombing while attending a pop concert in Manchester.”
Shasta Aziz, Globe and Mail, 2017-06-05
Do not call terrorists Muslim or Islamic. They are no more "Muslim" than the Ku Klux Klan is “Christian”