Being self sufficient in oil is an important economic and strategic objective. Being self-sufficient in renewables is no more important than a scouting proficiency badge.
besides the fossil fuel industries are X 100 [guess] times bigger employer and generates X2 the electricity [just checked] and does so far more predictably than renewables which have 0% of transport fuels, so a little tax incentive to keep such critical industries viable is probably money well spent.
