Sales team leaving homes at risk

Absolutely disgusted by the sheer laziness of the cold caller who came to my fathers house. Getting no answer,  as my father is dead, the caller decided to leave his leaflet wedged in door under the handle instead of posting it in the letter box. Now anyone passing by or potential burglers can see there's no activity at the house as the red leaflet is just wedged in the front door for how many days ?? Use your [removed] brains in future and I'll be sure to share this story to everyone I meet . 

   [MOD EDIT: Inappropriate language removed, please review the Forum Guidelines]