i don't know if i'd say that is "weak " per se. research can be driven by things such as curiosity and seeking knowledge/understanding along with liking to investigate areas one is interested in using scientific methods; or like you said later, by something you're excited about or actually care about. without a personal reason to come up with a research topic (i.e. maybe there's nothing one really feels like "researching"), it wouldn't be easy to come up with ideas that would last longer than the sounding board of one's internal thoughts.