The answer is often a function of how broadly or narrowly the power is based: is it centered in one person, or is it spread out among many different centers that exercise checks on one another? And are its subjects merely subjects or are they also citizens? In principle, narrowly based power is easier to abuse, while more broadly based power requires a truer story at its core and is more likely to protect more of its subjects from abuse.
Respect for the constitution of the USA. This is what the founding fathers tried to do.
