It's funny you mention bombing, because using a nuclear weapon on Mars to gain access to sub-surface ice and shelter is an entirely legitmate and effective way to start building infrastructure on the planet.
It's been seriously explored by NASA in the past, and I'm sure will come up again. Because when not used to target enemies, what is a nuclear weapon? A really big explosion. And unless you're ready to ship thousands upon of tons of TNT and two dzen 60 ton Mining Construction vehicles to Mars, using a 500 pound nuclear weapon to do your hole digging for you makes a whole lot of sense.