The fact remains that the President was killed whilst performing his duties as President, he was democratically elected by the majority of people
So why wasn't Gabriel Narutowicz burried at Wawel?
and died a loved leader,
Definitely no. He became a loved leader after his death. While he was alive, he was "loved" by no more, than 20% of Poles, while a majority thought he was an inappropriate person for this office.
Counting myself within this majority, I really admired Lech Kaczyński for his trials to improve relations with Jews, Ukrainians and Lithuanians, even against his party. Unfortunately, these were the only cases of LK going against his party's line. And I'm sad, that Jarosław Kaczyński managed to spoil mourning and divide Poles with such an idea. He must have known it would be a provocation. No one would say a bad word about LK, if Jarosław had not come with it.
Wawel is a place where people are buried who supported their country in a traditional catholic faith for a better Poland, Kaczynski will go down as a great political leader who wanted a true independent Poland, not a Russian or US State.
Wannabe is not enough. Poniatowski is remebered for commanding Polish forces in Napoleonic Wars and dying in a battle, Sikorski is remembered for commanding Polish forces in exile during WWII and dying on that occasion, Piłsudski is remembered as a father of independence and CiC during the Polish Soviet War (although his merits for Poland could be debated). Does Kaczyński really fit there? He will be remembered as a president, who died in an aircrash.