This question won’t last long.
No justification given in the edit log.
Browsing comments, I can see he got into arguments with people around the Chechen wars, but given the subject matter, the tone was not as acrid as it could have been.
I will draw attention to his name, though. Cf. Abu Omar al-Shishani, nom de guerre of Tarkhan Tayumurazovich Batirashvili, ISIS commander. Al-Shishani is Arabic for “the Chechen”. The user formerly went by “Chechen al-Shishani”, and changed it recently to “Emir al-Shishani”; Emir is a Muslim first name, but it is of course also an honorific.