This pipeline is in german interest.
You're probably right as far as short-term
interest is concerned. In the long run, giving the Russians a very nice tool to blackmail eastern NATO member states (which they will, have no doubt about it, use whenever they please) on top of large amounts of money can mean trouble - very expensive trouble. :)
Poland is on the best way to cut herself off the Russian gas -- we have to honour our present agreement, but when that ends Russians won't see our money anymore. Providing nationalist, hostile regimes with means to conduct their aggressive poitics is something that should usually be avoided (and, as a German, you should be well aware of that).
So, enjoy your cheap gas for the time being, and pray to your Friggor, Wota or whomever, that your cheap gas doesn't prove to be VERY expensive one day.
I want the EU crashed.
Well, that certainly explains your stance towards EU policies regarding energy sources supply policies. A Germexit? That would be interesting...
Do you want NATO crashed as well? Because last time I checked Germany didn't have nuclear weapons, and your Bundeswehr wasn't at all impressive, so if Poland falls to the Russians (armed with all the brand new stuff bought for the gas money), your chances of stopping them are rather slim. You may, of course, count on the Americans going into all-out nuclear war against Russia over Poland, Germany and the rest of Central Europe, but I really can't see that happening.
It wasn't that long ago when everybody in Poland, Germany and the rest of the EU realised the obviousness of solidarity and close European integration. Something very bad happened since then (also in Poland!). Well, I suppose all the money Russians spend on propaganda and anti-EU trojan horses in Europe wasn't spend for nothing. :(
Sad times are coming for Europe...