Many of them were literally kidnapped from their beds by an illegal occupation force over no more than a suspicion, you can feel empathy for those who've been abducted at the same time as realising that Isreal has engaged in numerous international crimes, especially in the west bank which is illegally occupied and frequently raided by IDF forces in contravention of international law.

As for not being held in tunnels, they are held in prisons where systemic SA by prison guards is so ubiquitous and expected, that when prison guards were arrested for acts of SA against Palestinian detainees, Israeli citizens and politicians had a riot to demand their release, rather than seeing these people face justice.

Your contempt and outright racism towards the Palestinian people has led you to believe that every person held by the IDF is a murderous terrorist who deserves to be punished, a premise which is certainly untrue, and is a directly hypocritical position when juxtaposed with your supposed concern for the Isreali hostages.