@Sachaski whether or not a building is on top of a 'legitimate' target (in ' ' as people's definitions of legitimate will vary), that does not negate the obligation to minimise civilian casualties. There are lots of options between "do nothing" and "bulldoze and bomb a hospital and shoot anyone who tries to leave".
Being in a tunnel isn't the protection it used to be. It makes things a bit more complex, but not, in my opinion, to a level that justifies what we're seeing happening.