The [Amnesty International] tweet calls Walid Daqqa “a Palestinian writer”, as if he had been imprisoned for his writings – as if he were the sort of prisoner of conscience on whose behalf I used to write letters on that special blue Air Mail paper, back when I was a member of Amnesty International.

To be fair, although you would never guess it from their tweet, the linked article by Amnesty does make perfunctory mention of the non-literary crime that caused Walid Daqqa to be put in prison:

On 25 March 1986, Israeli forces arrested Walid Daqqah, then 24, a Palestinian citizen of Israel. In March 1987, an Israeli military court sentenced him to life imprisonment after convicting him of commanding the Popular Front for the Liberation of Palestine (PFLP)-affiliated group that had abducted and killed Israeli soldier Moshe Tamam in 1984.