MOSCOW (Sputnik) — Aamer was the last UK detainee at the facility. He returned to London on October 30.
"Even if there is a war you cannot kill just anybody, you cannot kill kids, you cannot kill chaplains, you cannot just go in the street and get a knife and start stabbing people. If you are that angry about this country, you can get the hell out," he told The Mail on Sunday.
His statement comes a week after a 56-year-old man was stabbed at a London Underground station. Aamer, a Muslim, added that in Islam the murder of civilians was not allowed.
"The concept of war in Islam is not about indiscriminate killing. It is governed by rules that also cover how you should treat prisoners," Aamer said.
He expressed concern about the rift between Muslims and non-Muslims, saying it played into the hands of terrorists and helped their cause.
One of the most infamous terrorist groups claiming to follow Islam is Daesh, also known as ISIL/the Islamic State, outlawed in many countries, including Russia. The UK has been taking part in a US-led coalition of countries bombing Daesh positions in Iraq and Syria where the group is most powerful.