Please note that I am writing these reasons exactly as the Twihards did, including all of their grammar mistakes and spelling errors.

1. Twilight only has 4 books, and Harry Potter has 7.I tink this was a mistake of JK Rolling to make so many because some people don't want to read all of them but still want to know what happens in the end. I only read the first two and then the last chapter of the last book because some of the books were too long. I have seen all of the films though.

Okay. First of all, JK Rolling? Do you know how to spell? It's Rowling. R-O-W-L-I-N-G. Learn her name.
And how could you only read two books and then the last chapter of the last book? Do you have any idea how much information you missed? And if you want to talk about lengthy books, why don't you go take a look at some of the twilight books. They've got some fat on them too.

2. Twilight has characters who you can believe in. Edward is very loving and follows Bella and watches her sleep without her knowing. This is what a boyfriend should do- it's really romantic. He climbs through her window and keeps her safe by making her feel bad and threatening her when she does something wrong. This is really sweet, and Bella is lucky.

Before I start to prove you wrong, I would like you to read your second to last sentence. 'keeps her safe by making her feel bad and threatening her when she does something wrong.'
Proof that Twilight brainwashes people.
This sounds a lot like boyfriend abuse. Don't police officers tell you to report any threats that you get your way? And ironically, Bella's dad is THE CHIEF OF POLICE.
This is in no way romantic. IN fact, it is very stalkerish of Edward and abusive as well. In fact, if you were to look up 'signs your boyfriend is abusing you' many of things that Edward does would be right on that list.