@Num0
even if they did verified with ID what does it mean to you ? If they rob you , you will not get their ID data from Airbnb. So, ask them to show you photo ID at arrival , check the photo and person in front of you and write down all their data (name, citizenship, number of passport, country and date of birth) and make them sign it. so in case of any problems you will know your guests identity.
If they don't mind you can make a photocopy or a photo of their passports.
For the future, put in your house rules that photo id has to be presented on check in.
All hosts shoud do this, I don't understand why they are so naive and just let strangers come in their homes?