An MC A Day Keeps The Doctors Paid.

I had to be absent from certain classes this week due to events happening at home. First, my parents were moving and therefore I had to go back to my hometown to help them. Next, I have to skip one class to attend a family member’s wedding ceremony.
These events may seem unimportant to some people, but to a very traditional and family-oriented grandmother like mine, missing such events would consider you being not filial and disrespectful. So because I just cannot miss these family events, I had to miss a few classes.
I spoke to my advisor about my reason for not coming to class and I was told that unless I am sick with a Medical Certificate, I have no valid reason to skip school. In my opinion if that’s the case, then a Medical Certificate should not even be a valid reason to miss school unless you are admitted in the hospital.
This is because some people are not even sick and they go to polyclinics to “buy” MCs so they can skip school. This maybe wrong, but it happens. So if an MC is a “valid” excuse to miss school, I feel that some other reasons should also be accepted like major family events and other personal issues that make it really inconvenient for a student to go to school.
Sometimes things just happen and we just can’t go to school. Not every student can afford to go out and buy an MC so it would be very unfair for them to be blacklisted for their misfortune.
So, MCs should not be the only reason to miss class.
Why can’t other reasons be accepted?
Maybe the school’s policies on absenteeism should be revised.
What brought them to this conclusion in the first place?
Why are they so harsh about it and wont give any allowance?