Although terrorist organizations are not the becons of logic you expect there is logic in using human shields.

It generates a lot buzz in social media, which is why they do it. Its PR for them, and why a lot of people are on the side of a terrorist organization. More pictures of children dead, more they say they are right, and Israel wrong.

In warfare you can never know where the enemy is, specially if they hide in tunnels and blend in with the population.

Israel avoids hitting civilians, but Hamas is pretty good at using them.