a long bus ride

I feel like a terrible parent because Lance is going to ride the bus home from school.  I feel terrible because it is a 30 minutes bus ride though it is only a 5-8 minute car ride.
I feel like a terrible parent, but then I feel terrible picking him up to.
Pros for riding the bus
-lily can take a long of a nap as she wants, i won't have to wake her up to go pick up lance and since she will have a long day at preschool this will be crucial for the rest of the afternoon
-it save my gas and time, I don't have to make an extra trip and wait in the carpool line, it is a 30 minute bus ride, it is 20 minutes of my time to drive over, wait in line, and drive home
-isn't it better for the environment, the bus is already going so why use my car
-it is better for my mental health, I am a bit fed up with parents behaving badly in carpool line, cutting in line, parking their car and holding up the line, etc.

Cons for riding the bus
-his bus is one of the last ones to arrive at school
-it is a 20-30 minute bus ride, we usually get home 15-20 minutes before the bus gets to our house
-he's my innocent sweet baby and there might be mean 5th graders and I am not there to protect him from mean children or from feeling afraid, this will be his first bus ride
-did i mention it was a long bus ride

Really the pros out weigh the cons especially since I will be picking Lily up from preschool between 1 and 1:30 which puts her down for nap around 2 which may not be enough time for rest if I have to get her up at 3:20 to go get Lance.

The thing I don't understand is why I feel so horrible about having him ride the bus.  He might actually like it.  Why do I feel like a bad mother?  Well we are going to try it tomorrow, I hope that he likes it, it would make life a bit easier some days, especially Wednesdays.