Robert Spencer 
Besides
removing supposed temptations to idolatry, Islamic jihadists want to
destroy the artifacts of non-Muslim civilizations because doing so
testifies to the truth of Islam, as the Qur’an suggests that the
destroyed remnants of ancient non-Muslim civilizations are a sign of
Allah’s punishment of those who rejected his truth:

Many were the Ways of Life that have passed away before
you: travel through the earth, and see what was the end of those who
rejected Truth. (Qur’an 3:137)

This is one of the foundations of the Islamic idea that pre-Islamic civilizations, and non-Islamic civilizations, are all jahiliyya
— the society of unbelievers, which is worthless. Obviously this cuts
against the idea of respect for non-Muslim religious installations.

“Sad scenes at the Orthodox Christian cemetery in Priština – a chapel
turned into a public toilette, many graves overrun by weeds,” Serbian Orthodox Diocese of Raska-Prizren and Kosovo-Metohija, October 3, 2016:

On the occasion of a recent visit to the Serbian Orthodox
communal cemetery in Priština, Fr. Saša Mitrović the local priest could
see sad and disturbing scenes. Recently repaired and cleaned the
cemetery chapel was turned into a public toilette and a garbage dump,
many graves have been overrun by weeds. Regrettably, this is happening
regardless of the communal care by Priština municipality and a presence
of a paid guardian. These scenes remind so much of those in the church
of Christ the Savior in downtown Priština where the Serbian Orthodox
Diocese began cleaning of the site from garbage. The cleaning was
interrupted by municipal inspectors (without any judicial order) who
forbade any access to the church and continuation of the cleaning.
As the All Saints Day is approaching many Priština Serbs, the most of
which cannot freely return and live in the city of their birth, will
visit the graves of their dear ones. It is the duty of the Diocese to
organize cleaning of the cemetery chapel and the cemetery. There remains
a question whether the Priština mayor will be so ardent to send
inspectors again and suspend the works alathough [sic] he has done done
nothing to prevent using the Orthodox Christian sites as public
toilettes.
Bishop Teodosije has given a statement that it is so disturbing and
difficult to understsand [sic] that in the Kosovo capital in 21st
century Christian sites are used as public toiletters. This demonstrates
and alarming absece [sic] of culture and elementary civilizational
norms, said the Bishop. Priština Mayor Shpend Ahmeti has recently said
in his interview to KIM radio that it was not the duty of the
Municipality to take care whether religious sites are vandalized or
damaged explaining why he did not take any measures after numerous
vandalisms and the recent setting of fire in the church of Christ the
Savior. However, as Ahmeti said, the Municipality ir [sic] responsible
to prevent “any repairs” in these sites including cleaning and
white-washing of walls. Such blatant manipulations with religious rights
are a shame for the Kosovo society, said Bishop Teodosije, emphasizing
that no one can stop the Church to take care of the dignity of her holy
sites and protect them from vandal attacks.

https://www.jihadwatch.org/2016/10/kosovo-muslims-turn-orthodox-christian-chapel-into-public-toilet