ah, but they do clearly say so in both interviews and their charter.
some quotes from the charter:
Israel will exist and will continue to exist until Islam will obliterate it, just as it obliterated others before it" (The Martyr, Imam Hassan al-Banna, of blessed memory).
article 7: "The Day of Judgement will not come about until Moslems fight the Jews (killing the Jews), when the Jew will hide behind stones and trees. The stones and trees will say O Moslems, O Abdulla, there is a Jew behind me, come and kill him. Only the Gharkad tree, (evidently a certain kind of tree) would not do that because it is one of the trees of the Jews." (related by al-Bukhari and Moslem).
(where can i get a Gharkad tree?)
https://avalon.law.yale.edu/20th_century/hamas.asp
Charter of 1988, subsequently 2017 document I referenced shows Hamas has moved from this position. If you compare 1988 and 2017 documents that shows a clear shift.