I spoke too soon!

Well yesterday was a great school day therefore I should've known today wouldn't go as smooth. I have the worst headache. I spent half of the morning trying to calm down a little preschool girl. She thought it was scary to come to school and I felt sorry for her until she continued to scream her head off for over an hour...then I was sick of it. I called her mom and dad after twenty minutes of this and all the parents did was come back and forth, in and out of the school the rest of the morning (completely interrupting me and my class) comforting their little girl everytime she made a peep. Well that's not going to happen in my classroom anymore!!! (Gosh, I wish I had enough guts to say it like that directly to the parents.) Everytime her mom and dad slipped out of the room she'd scream again! Her parents ended up staying the whole three hours of class watching me and my assistant struggle with their little girl. Cut the cord kid! I'm starting to realize that I don't think I have enough patience to work with this age group anymore...and it's only the second day of school. AAHHH!
I know it's scary for a kid to enter into a place where they're not familiar with the surroundings and the people, but I wish that parents these days could teach their kids to be more respectful towards adults. I put up with a lot of crap from kids as well as some parents. Can't they just for once say thank you for all you do and try to help you help their kid? I speak with many parents at the end of the day and let them know how their child's day was. I've noticed more and more the parents that have children who misbehave tend to "blow off" the teacher and not confront their child's situation...they simply look at me and think that I don't understand (because I don't have kids). A simple "tell Miss Melanie you're sorry and you will behave better tomorrow" would be nice. (Think about it...sometimes a teacher is around a child more than their actual parent is.)
I believe that children have nothing to fear anymore. I remember growing up and having a fear of authority...authority being my parents. I knew that if I did something wrong or disrespected adults that there would be consequences...and perhaps a spanking. Today children don't have consequences, they don't even know right from wrong and they certainly have less respect for adults. HELP! Is it wrong for me to feel this way?
Preschool teachers get a lot of crap because many people think that we do nothing but "play" with the kids all day. Well...we help create the foundation of a child. We help children grow into who they want to become in life. Children are like wet cement; whatever falls on them makes an impression. Teachers as well as Parents make that impression.
Yes this was only one day, one situation with one child. I just needed to vent.
I guess I can only grow from this experience. Maybe situations like this will only make me a better parent someday.