Because if they knew what they were signing, they'd know that as soon as the interest rate started to rise, the monthly payment would also increase, they wouldn't be able to pay anymore and  they would end up without a house.
لإنهم لو عرفوا ما الذي يوقعون عليه، كانوا سيدركون أنه بمجرد أن تبدأ نسبة  الفائدة بالزيادة ستزداد قيمة القسط الشهري وماكانوا ل يستطيعوا الدفع أكثر  و سينتهي بهم الأمر دون منزل