I think the desire to throw grenades over the fence comes more from the neighbor coming over the fence once in a while and murdering anything he finds.
You forgot to mention your neighbor razed the yard and killed some relatives too. Throwing some Molotovs, while it may not justified, is still an expected reaction.
I think the desire to throw grenades over the fence comes more from the neighbor coming over the fence once in a while and murdering anything he finds.