The simple answer is that kerosene and JetA1 are refined to different fuel standards. The refining standards are set by the ASTM in the U.S., and by other local fuel standard agencies in other countries.
Aeronautical fuels such as JetA1 have very important additives to prevent fuel or engine problems that can develop under aviation operating conditions.
These additives are typically (but not limited to)... rust preventatives, anti-foaming additives, anti-bacterial additives, anti-icing additives, lubricity improvers...
In addition, refining standards and handling procedures, are much tighter for aviation fuels, than for common ground-use fuels. Standards for contamination in both refining and handling, are very much lower for aviation fuels.
Regular Kerosene and heating oils never leave the ground, and any problems with contamination and lack of additives in these fuels, in their designed use areas, doesn't rate a mention.
However, indulging in flying, using these ground-based fuels, could leave you wishing you had used the fuel specifically recommended by the manufacturer of your aircraft... particularly when the ground is rushing up to meet you at an alarming rate... as result of using a grade of fuel not designed, or refined, for aviation use.
