I think that's accurate.
I know when I brought my family here we visited the indigenous war memorial as well as the Tomb of the Unknown Soldier, so I can understand why you're making that assumption.
If we look at averages, putting aside the last couple of weeks, we see that we average about two incidents a year. Is that correct? Those may range from somebody, as you said, urinating on the Tomb of the Unknown Soldier, using it as a public toilet.