Palestinians have a legal right to armed struggle
It's time for Israel to accept that as an occupied people, Palestinians have a right to resist - in every way possible.

Cohen, Stanley L.
http://www.aljazeera.com/indepth/opinion/2017/07/palestinians-legal-armed-struggle-170719114812058.html

Publisher:  Al Jazeera
Date Written:  20/07/2017
Year Published:  2017  
Inactive Serial

Resource Type:  Article
Cx Number:  CX21094

International law recognises the fundamental rights to self-determination, freedom and independence for the occupied. For Palestinians that includes the right to armed struggle.

Abstract: 
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Excerpt: Finding evolving vitality in humanitarian law, for decades the General Assembly of the United Nations (UNGA) - once described as the collective conscience of the world - has noted the right of peoples to self-determination, independence and human rights.

In relevant part, the resolution not only went on to affirm the right "to self-determination, freedom and independence [...] of peoples forcibly deprived of that right,[...] particularly peoples under colonial and racist regimes or other forms of alien domination" but noted the right of the occupied to "struggle ... and to seek and receive support" in that effort.

The term "armed struggle" was implied without precise definition in that resolution and many other early ones that upheld the right of indigenous persons to evict an occupier.