You probably are a danger to others on the road, yourself and your family. More than 8 hours behind the wheel in a single day is irresponsible.
https://blog.orbcomm.com/tachograph-rules-european-drivers-h...
but when they are caught exceeding the limits they are hit very hard (possibly including confiscation of the vehicle & cargo, as well as massive fines and possibly loss of drivers license). And that's good for everybody, the lorry drivers included, it gives them the expectations of a reasonable work day as well as the improved safety for everybody else and a level playing field. Fraud with these devices used to be rampant, it is getting a bit better now with the digital generation which is more tamper proof.