Cracking ?
Answer:
have you got a car ? the fraction of distillable gasoline in crude oil is a very small percentage, so oil companies do the cracking process to reduce the molecular weight of heavy olefines and obtain more distillable gasoline and diesel.
do you like soft drinks ?
steam cracking also produce "needle coke", that is very valuable for producing electrodes for aluminium industries to reduce the aluminium and make your can of coke.
FFC cracking produces an high amount of C3-C4 insaturated olefines, that are perfect for plastic industries.
isobutene is for example the main ingredient for polypropylene.
Convert asphalts, tars, diesel, kerosene, etc into higher value product.
Convert aromatics and polyaromatics into products that burn without poisoning the environment.
Reason untimately: The refinery model. You produce things in a way such that the product gives you maximum profit with the resources at hand and without having to take undo risks. (Shutting down a refinery operation is always frowned upon because it is such a dangerous operation, as is startup.)
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