Human nature may be multi-layered, so choosing kindness is not always without reservation; sometimes it stems from the heart, and sometimes it is inevitably weighed against the pros and cons. It is precisely because of this that true kindness is even more precious.
If you say: ‘Kind people may not necessarily be smart, but truly smart people will choose to be kind,’ that would be underestimating kindness. If you don’t believe it, try giving an unfinished task to a colleague and see which smart colleague is willing to help.