Although Sirhan wasn't Muslim, popping Kennedy as revenge for his support of Israel and the Six Day War was quite the Jihadi move and I'm sure it was noted and studied by the Islamists.
He hated him before that -- at least, according to his diaries.
"Sirhan supposedly believed himself deliberately betrayed by Kennedy's support for Israel in the June, 1967 Six-Day War, which had begun exactly one year before the assassination. However, the "RFK must die" diary entries started before Kennedy's support of Israel became public knowledge. After his arrest, these journals and diaries were discovered."