Archi you're wrong about that wts with no tpa may or not caught a crime attempt on your province. For sure it will not prevent another attempt. The reason is the one doing the crime will lose no thieves. However if the defending province has a tpa, when the one attempting to do a crime on sed province fails they will lose thieves. Losing thieves lowers the t/ms tpa in affect weakening a t/m and thus increasing the odds of failing again. The higher tpa the defending province has the more thieves the attacking province will lose when the wts catches the enemy's thieves.