Are they simply trying to remove any obstacle to ruling by decree?
Pretty much. The saving grace is that the provinces hold significant amounts of power, and the opposition isn't as weak as some PiS voters think it is. People are already on the streets, and the crucial thing is that it's a very non-partisan movement.
If what PiS is doing is for the good of the nation then why are they subverting the rule of law?
PiS have never respected the rule of law. By appointing a PZPR prosecutor to a leading role, it's clear that they have no real respect for law beyond the law that they themselves introduce. They behaved in exactly the same way between 2005-2007 - and like we all said, history will repeat itself as soon as Kaczyński gets near power.
As Marshal (speaker) of the Sejm, on 10th April 2010 Bronisław Komorowski became interim president following the death of Lech Kaczyński
Wrong. Article 131, paragraph 2 makes it clear.
.The Marshal of the Sejm shall, until the time of election of a new President of the Republic, temporarily discharge the duties of the President of the Republic in the following instances:
1) the death of the President of the Republic;
Therefore, it was automatic.
Article 131, Paragraph 1 -
If the President of the Republic is not in a position to inform the Marshal of the Sejm of his incapacity to discharge the duties of the office, then the Constitutional Tribunal shall, on request of the Marshal of the Sejm, determine whether or not there exists an impediment to the exercise of the office by the President of the Republic. If the Constitutional Tribunal so finds, it shall require the Marshal of the Sejm to temporarily perform the duties of the President of the Republic.
This makes it very clear that it refers to the President being incapacitated, which is not the same as death.
Just counted - from what I can see, the Constitutional Tribunal still has a majority (until the 19th December 2016) of pro-Opposition members.
Are we about to see a real constitutional crisis if the Tribunal throws out the PiS laws?