You haven't lived in times where there weren't enough buses to go around, being that due to lack of diesel or just the buses are broken.When you miss your bus because you are late, then it's OK. But missing your bus because it's overstuffed really sucks, especially when you have to wait another hour for the next one. And it could also be overcrowded :)
So yeah I can't expect a person coming from western countries to understand it, but getting on the bus is really important when you have lived through those times :)