The problem is all these things need long term planning, and investment returns over 10-20 years. No company is going to invest billions into exploration and production facilities if there is a chance that sometime in the near future the govt changes it's mind and pulls the rug out from under it. Much safer to invest that money where you trust the govt to not change it's mind.
Yep I'm sketchy on the details (so correct me if I'm wrong) but I understand that one of, if not
the main reason that Shell pulled out of it's stake in the Cambo oil field off the Shetlands was a lack of government support, which is understandable after the Oil & Gas Authority vetoed Shell's plans to develop the Jackdaw gas field in the North Sea.

The way the tree huggers and yogurt knitters have captivated our politicians and influenced policy is quite worrying to be honest and it's really not going to end well.

I have intelligent university educated friends who think the Swedish girl who bunked off school is some sort of messiah, and that the Insulate Britain/Extinction Rebellion crowd are
" just doing what needs to be done. " 
Thing is... They're the sort who'll be the first to get outraged when their gas bill lands on the mat and they'll quickly start ranting about the effing Tories! Sigh...
