There are a lot of schools of thought that address the paradox of short term sufferings involvement in the overall scheme of kindness. Buddhism refers to it as "idiot kindness" or "idiot compassion" if you're kind in the short term without considering the long term value of it.
True kindness is a long winded, structured and considerate thing. Feeding a junky drugs because it makes them feel better is an example of it done wrong, I would still entirely consider it kind and compassionate to will someone through a process such as what you've illustrated here if you had a genuine understanding that it was going to provide them these kind of benefits.
Clever and kind are never that clear or opposed in the sense of dichotomy. At the extremes of it maybe 'clever' looks like not helping people at all because it frees up resources for the rest of the community, or 'kind' is euthanasia. The subjectivity of it all is the integral, and hardest, part of the process of assessing what's 'best' for an individual.