I'm an armchair general too, but digging tunnels and fortifying oneself as preparation to attack something is a non sequitur.

Are suicide bombers and random missile attacks on civilian centers defensive too? After all these years, why now stockpile weapons and build tunnels - including tunnels into Israel?

In any case, as I said in my original post, Both sides are preparing for war. Regardless of which side you favor or make excuses for - for whatever reason-, they are preparing and it's likely to begin this spring/summer.