Wa-Alaykum As Salaam
Allahﷻ protects the Holy Qur'an from many different aspects. Most scholars agree that the only "change" in the Holy Qur'an is that of interpretation where different schools interpret different Ayas differently. But in terms of addition, subtractions, or use of different words in place of what is in the Holy Qur'an etc - Muslims are unanimous (by and large) that the Holy Qur'an is the Divine word of Allahﷻ and that what we have today in our hands is the verbatim word of Allahﷻ that Angel Jibrael peace be upon him, came to the Prophet, peace be upon him and his Purified Household, with.
Those who think there have been changes rely on weak evidences and fallacies.
Created with choice:
However, mankind was also created with the power of intellect and choice. So the choice to disrespect such a divine article is one that stems from that power. And indeed, each action is accountable on the day of judgement.
What is the Holy Qur'an?
The question is then... what is the Holy Qur'an? Because what is printed as a book is in fact merely ink and paper. Yes we must respect it, only touch the words with purity and ablution etc... however, those who burn or disrespect the "book" are not doing any harm to the Holy Qur'an that is in the heart of the Muslim, rather, they are simply destroying their own destination.
So do not worry to much about this because history has proven time and again that no matter what the enemies do, the Holy Qur'an will always remain protected.
Invitation of Jinns:
Jinns should not be invited in the first place especially where it may cause harm, and those who do so by disrespecting the Holy Qur'an have sold their religion for worldly benefit.
No curse or punishment?
The Divine Justice does not necessarily occur in this world nor does it have to be something visible to others, nor immediate.