Privately manufactured bombs are common enough to be a problem - and there is a very plausible threat of life imprisonment ( or possibly execution ) for anyone who engages in such behaviour. That an augmented brain with the inclination to doing something analogous would be effectively punishable is open to doubt - they may well find ways of either evading the law or of raising the cost of any attempted punishment to a prohibitive level.

I'd say it's more useful to think of power in terms of things you can do with a reasonable chance of getting away with it rather than just things you can do. Looking at the former class of things - there are many things that people do that are harmful to others that they do nevertheless because they can get away with it easily: littering, lying, petty theft, deliberately encouraging pathological interpersonal relationship dynamics, going on the internet and getting into an argument and trying to bully the other guy into feeling stupid... ( no hint intended to be dropped here, just for clarity's sake ).
Many, in my estimation probably most, human beings do in fact have at least some consequence-free power over others and do choose to abuse that minute level of power.