Your phrasing and bit-by-bit posts makes it look troll-like. But I see where you are heading (mainly by your post to the CCW poster where you said “would you use it to protect your family”).
So - the actual question might be “Why do we have nukes if we aren’t willing to use them in our fight(s) against terrorists, Saddam, ISIS, etc.”
I think that at the moment it would be considered “premature” by the rest of the world, and make us look like the bad guys. Heck, we are looked at as the bad guys for using them to end WWII against people that really do make ISIS look like the JV team.
Under Obama, he had really limited our rules of engagement. If we have to continue the fight against terrorism, and remove them from their havens where they can plan their attacks, I think there are lots of other standard options available.
I suppose once the terrorists use chemical or dirty nuke bombs, then the gloves might come off and the world would understand the scope of things. But still, there needs to be a leader that can communicate that in war, even with today’s more accurate and better weapons, civilians near our enemy will be killed. But, the sooner we can end, and win, the war - the fewer civilians on both sides will be hurt or die.
They have already beheaded people, drowned people, raped and stoned women, killed children, crucified people. You cannot deal with them like a “normal” enemy. Either we fight to win at all costs or we lose.