Frustrations with students...?

I am a private music and French teacher, and have been doing so for three years while I attend university.

I am frustrated.

I love teaching and helping others, but at the same time, I've grown to have expectations from my students; that they will try their best, and that they will do their homework/practicing so that they can improve.

I am strict, but fair. I try my best to help them with their practicing, often I even sit down with them and create practicing schedules that fit their times/needs, and we do it every single week to allow for random events that come up. With some students this works really well.

With the rest, the students eventually leave me, and I feel a big part of it is the parents. They don't force their kids to practice and say to me that this is "purely for personal enjoyment". Maybe I'm too hard-core, but don't you take piano lessons in order to learn more about music? You can't learn more if you don't practice, and frankly, practicing is something that should be enjoyed, and I try to encourage that philosophy of practice. The latest student that cancelled lessons with me is the one I am frustrated the most about, because the parent let me know in an email that their child would no longer be receiving lessons from me, saying that it was because I was trying to get them to understand that their child needs to practice (and yes, I brought this up to them many times), and they just wanted her to have fun. Sorry, but piano lessons need to be a mixture of both. You put in the hard work and you enjoy what you're doing. This student had a bunch of things on the go, and honestly admitted that they valued tv time more than practicing, but that once they started practicing, they loved it.... That's a sign of a student who enjoys piano and needs to practice, but just needs a little push from parents. "We encourage our child to practice, and tell our child that they need to do it, but our child just ignores us. We aren't going to force them to practice." This child is between the ages of 5 - 8, and I think personally this is the perfect time in a child's life to learn about time management and about valuing their opportunities. If their tae kwan do and tv is most important to them, then music isn't something they should be doing. ***Just as a note, I'm not saying down-time and tae kwan do should be less than piano, I'm saying that if it's what they really wanted, they should've set aside time for it like my other 30 students seem capable of doing.

So, how far off base am I? And how much am I going to hear that I'm a total b****?