Do you deny that EU has a limited geopolitical independence and the US exerts a strong influence over it? In my book it's called a leash. It's not so different from Russia trying to keep on the leash (with varying success) countries like Belarus, Armenia, Kazakhstan and other ex-USSR states.

1) If we will take into account how much Gazprom pays Ukraine and Poland for the transit and estimated cost of associated risks, then additional cost of a sea pipeline is nothing. Ecological concerns are hugely overblown in an attempt to stop the pipeline, Nord Stream 2 is effectively a clone of Nord Stream 1 and there was little to no concern at the time it was built.

2) Aggression against Poland? Are you kidding? As for Ukraine, it's a very difficult conflict with deep historic and cultural roots. I want to ensure you, as someone who is quite familiar with it by personally hearing stories from people in Crimea and from reading various sources based in Russia, Ukraine, and the West, that Ukraine is FAR from being a cute democracy-aspiring little victim of the big evil Russia as depicted by the western propaganda (e.g. see [0] if you are not familiar with the current situation inside Ukraine). Russia of course is not without a blame, but most of its actions, while drastic in nature, have a clear logic behind them and dictated by its interests and well-known phobias.

3) How dares Russia, the Evil Empire, to exert and expand its influence over other countries! Only forces of good (read USA) can do it! It's a pure matter of bilateral relations between Russia and Germany (modulo intra-EU obligations taken by Germany). Why the hell do you think the US and Poland can have their say in it? Also note that the previous gas conflict with Ukraine (which largely kick-started Nord and South streams) has happened long before 2014 and that it has roots as far as in the 90s.

4) You continue to repeat the same propaganda assertion without backing it up, while I have presented the numbers which clearly show that amount of supplied gas will stay approximately the same, thus the dependency will not rise. Instead gas transit between Germany and Russia will become independent from the middle-man countries. Will transit through Ukraine decrease significantly? You bet. But Russia is under no obligation to feed the hostile regime, which can not even properly take care of its transit system.

5) No, it's the other way around. Natural gas does help to increase renewables share. Gas plants are the best tool after hydro storage to compensate for their intermittence with a relatively small environmental impact. It's one of the reasons why Germany is so interested in the pipeline, due to its heavy bet on renewables instead of nuclear it needs natural gas since Norway hydro and domestic storage is not yet sufficient. Until the energy storage problem will be properly solved at the required scale, natural gas and renewables will go hand to hand (though in the following decades natural gas may get essentially rebranded into hydrogen, but most of its generation will be still from NG). If you are so worried about climate, then start with Poland which in this day and age still uses coal for 70% of its electricity generation, but instead for some reason you attack much cleaner gas instead.

6) So you do admit that companies which invest into this project will make profit of it and are eager to do it? It makes the project commercial in my book. The fact that it also has a nice political bonuses for the involved countries is nothing more than an icing on the top. Your claims about destabilization are highly subjective and debatable. If anything, stronger economic ties between Russia and Europe will only contribute to stability of the region (at the expense of the US influence over the key countries).

7) Yes, because large capital does not like to invest huge money into projects which can be later shut down by politicians. So they lobby such project beforehand and only start investing into it seriously if sufficient backing and insurances have been achieved. If anything, it only confirms the commercial nature of the project. Or do you think that Russia has bought all those European politicians in the current anti-Russian climate?

[0]: https://news.ycombinator.com/item?id=26381672