Because they like money. Why would you not pay your politicians a few millions if you can make billions of it?
From a politicians stand point there are some reasons for these subsides (other than getting money from the companies). First is always creating/keeping jobs in the country and without subsidies it might be more profitable to produce somewhere else. Then there are strategic concerns about fossile fuel production in case of a war or durring a crisis.
Also if they are profitable depends very much on the specific sector and if you include things like ecological deamages.
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