maybe they started to looked a bit dead if they were 3 months old ?
or was it stuff that lasts?
but sometimes the grounds keepers go around and remove dead ones, just to tidy up.
but yes its bad when people do that - i think they bizarrely believe that its somehow 'doing the best they can' for their loved one, giving them the best stuff - but how respected and nice would that person feel to be given stolen flowers?
i guess some dont care though - its all about how they appear to others that matters to some people ... rather than the truth..