Another level of irony is that this is partly because Europe does not want to develop shale gas for environmental reasons, so it imports US LNG... which is mostly shale gas [1].
The US love Europe's policies...
[1] https://www.reuters.com/business/energy/surging-us-lng-expor...
The environmental issues with shale gas are local, if you ignore global warming as a whole. So in that sense, not doing it in your own back yard makes a lot of sense.
Global warming is the biggest harm though so it doesn't make sense to ignore it.
I'm not so sure. As a whole, yes, global warming is a huge issue, but one shale gas well alone will surely have very marginal effect on that. Comparing that to the fact that it can seriously contaminate groundwater and air in your imminent vicinity seems like a more serious issue in that regard.