> However, on 26 October the Metropolitan Police dropped the charges, revealing that they had discontinued their criminal case against Mustafa because there was "not enough evidence to provide a realistic prospect of conviction".[25][26][24] Under the Victim's Right to Review Scheme, one of the complainants in the case then requested that the Crown Prosecution Service review their decision to terminate criminal proceedings.
#killallmen is not meant as a serious threat against any one person, or even a group of people. It is meant as an—albeit radical—battle-cry to topple the patriarchy. At least that is how most courts and most moderators see it, so censoring it like if it were a serous death threat would always be rather silly.
Previously you could tweet "kill all white men" and nothing would happen. Not so much with the same statement targeting a different group.