. The importance of the monument will be reduced. The number of people who who would like to visit the monument will be reduced.
. We can talk to the people and make them understand that writing on the walls is spoiling the beauty of the monument. or writting or scribling on the walls will be a punishable offence.
.3. by putting posters and banners to not scrible on the walls.
. the foreigners may have a bad impression on us.