Stealth is hard in space. Not actually impossible when the opponent is a colony with the population of approximately Luxembourg, especially for a mostly-unpowered payload that doesn't need to be kept at 20 C the whole time, but it is hard.
Nukes can fly, but for that transit you get far more opportunity to shoot them down. Bigger issues are "why are they bothering to target Mars, there's not much there" and "oh wait, that was a great place to stick a second-strike capability, Outer Space Treaty LOL, so of course it's being targeted".
Nukes can fly, but for that transit you get far more opportunity to shoot them down. Bigger issues are "why are they bothering to target Mars, there's not much there" and "oh wait, that was a great place to stick a second-strike capability, Outer Space Treaty LOL, so of course it's being targeted".