That's not the order things occurred. When Israel left Gaza it left it to the Palestinian authority and it wasn't blockaded (there was some partial blockade but it was practically open). The present walls and barriers around Gaza were put in place after the disengagement as a response to specific attacks coming out of Gaza.
The previous restrictions on Gaza were also a result of attacks coming out of Gaza on Israeli civilians.
If the population was starving while Hamas, the government of Gaza, managed to smuggle in RPGs, assault rifles, lathes, trucks, rockets, mortars, sniper rifles, heavy machine guns etc. then clearly the issue is a matter of their priorities, not Israel. Hamas stole concrete to make tunnels, used water pipes to make rockets, was the elected government, and is completely responsible if its population is starving (which I don't think was true anyways). You're also somehow conveniently leaving Egypt out of the picture. Why should Israel feed its enemies (and allow them to work in Israel, and give them water and power). Egypt could have done all that. But Hamas didn't only pick a fight with Israel- they also collaborated with ISIS in Sinai and picked a fight with Egypt.
They "randomly attacked Israel one day" because they are consumed by hate and religious fanaticism. Just listen to what they say. If they chose peace, they'd get peace, Israel has no interest in randomly attacking them.
The previous restrictions on Gaza were also a result of attacks coming out of Gaza on Israeli civilians.
If the population was starving while Hamas, the government of Gaza, managed to smuggle in RPGs, assault rifles, lathes, trucks, rockets, mortars, sniper rifles, heavy machine guns etc. then clearly the issue is a matter of their priorities, not Israel. Hamas stole concrete to make tunnels, used water pipes to make rockets, was the elected government, and is completely responsible if its population is starving (which I don't think was true anyways). You're also somehow conveniently leaving Egypt out of the picture. Why should Israel feed its enemies (and allow them to work in Israel, and give them water and power). Egypt could have done all that. But Hamas didn't only pick a fight with Israel- they also collaborated with ISIS in Sinai and picked a fight with Egypt.
They "randomly attacked Israel one day" because they are consumed by hate and religious fanaticism. Just listen to what they say. If they chose peace, they'd get peace, Israel has no interest in randomly attacking them.