It's easy to make claims like this with no proof on the internet, but do you have any examples of someone successfully winning a case against their landlord for something like this? Or do you just mean i can literally sue my landlord? If so i can sue anyone for anything. Whether the case has any merit is a different story.
Please provide a real world example if you can
No direct examples but in case where the landlord would be negligence and then be liable would be if some one is rob and the landlord failed to replace the locks as tenets move out. Or the locks did not work as they should. Windows did not have locks and so on. Outside lights fail to work (not burnt out but do not work at all) would be another area they could get busted for. Not having working blinds is again something else they could get in trouble for since the tennets could not light up the area around the house or close blinds to prevent people from seeing in.
While the person who robbed the house yes should be busted for it the landlord at the same time failed to meet his/her legal requirement and proved inadequate security.
Apple security on it was that of having only the door knob lock working. the dead bolt did not work.