Footballers really don't care about security. The unmarried ones being the worse.
I deal with them all the time, and their attitude may be due to the transient lifestyle.
Their houses are more like hotels then homes. People are constantly coming and going throughout the day. So they have to trust these people as it would be impossible to get things done otherwise.
I get to drive a range of very exotic cars due to them being in the way of my work. Most of the time the keys are just left in a bowl with money/watches and jewelry. I have been given new cars for weeks to learn the functions, then give a quick lesson when they return to the country.
If they are not at home, i will normally just be left a note/text saying "sort yourself out". Laptops and iPads are left scattered around the house.
You wouldn't believe the amount of times i have arrived at an empty house only to find the alarm off and all the doors unlocked!