I do agree with what you say to an extent. You see, there are
some group of senior citizens who are either illiterate or whose
parents did not place much emphasis on courtesy and consideration
of others while bringing them up. But back then when they were
struggling under much harder economic times in a 3rd world
Singapore, I doubt being considerate is anywhere near their
minds.
I only frown upon those younger generations who now have all the
luxuries in modern Singapore, who are far more "educated", and who
are simply arrogant, selfish, and thoughtless while commuting in
public transport.
This problem with widespread INCONSIDERATION is the direct
personification of the saying; "What goes around, comes around."
People are doing unto others, what others have done unto them. This
is a vicious cycle although wrong, can be very hard to stop,
because outright selfish people still exists & are still doing
unto others who are not selfish or inconsiderate by nature.
