I'm opposed to capital punishment, but this made me reconsider.
First, of course, the prattle about "superpower." People keep using this word, I do not think it means what they think it means. If you could only have "an innate sense of right and wrong" by being born on Krypton or exposed to Z-rays, then humanity would be doomed. I'm not even sure what a sense of right and wrong is, to be honest, but it appears to be a normal part of the human endowment. But the reference is basically empty blather, because people disagree widely about what is right and wrong, and even when they agree they don't always act on it. Acting on what one believes to be right is not universal, but it's not a superpower either, any more than athletic ability, artistic ability, or (redundantly) singing or dancing superbly. These are all human abilities, and they are distributed on something like a continuum: individuals have more or less of them, it's rarely if ever either/or.
Second, Sanders has not been right about everything. To give just one example, he parrots the lies of US propaganda against the legally elected, legitimate government of Venezuela, though he stops short of endorsing military action to bring the regime change about. There are actually quite a few people who've been better on such matters than Sanders has been, and even they are not perfect.
Now, I agree with Sanders on most issues. I voted for Sanders in the 2016 primaries, defend him against centrist Dems' false accusations, and will vote for him in the 2020 primaries. I've made some small donations to his campaign this year. If he wins the nomination, I will vote for him in the general election as well. It is possible to support and vote for a politician without indulging in ridiculous fantasies about him or her. On the contrary, uncritical and delusional support and adulation for politicians or other public figures have a lot to do with the problems we have now.