What is the root condition for (each of the) unwholesome roots of greed, ill-will and delusion (raga, dosa, moha)?

Would it be helpful, wholesome, skillful and wise to investigate the root condition of (each of) the three poisons/unwholesome roots of greed, ill-will and delusion (raga, dosa, moha)? [Why these three and not some random qualities like baseball, terpenes and a Farm Aid concert?] And why do vast amounts of beings seem to tend more towards lust, ill-will and ignorance instead of wisdom, wholesomeness and skillfulness? Why is our true nature still mostly obscured?