I also think most of these kids who throw tantrums just have a complete lack of structure and discipline in their lives. Parents are such pussies anymore - they won't spank or do time-outs or ground the shits. They choose to discuss their kids' feelings and all that GD/AP shit. This itself could be caused by several things, and maybe a combination of things:
- Adults who still hold grudges against their own parents for physically punishing them, claiming it has emotionally and mentally scarred them. So they choose to not make the same "mistakes" with their own kids, and probably breed in order to prove to their own parents that a child can be raised without hitting. I don't mean cases where kids get abused, but just plain old spanking and normal punishments. An adult who holds a grudge against their own parents for parenting them for their whole lives is definitely unstable. The end result is someone who parents their child as little as possible, which results in a brat.
- Sheer laziness. Someone who is a lazy sack of crap will not suddenly become a hard-working, independent person when they spawn. They'll just be lazy about raising the kids too, and then the kids turn into feral monsters.
- Fear of losing the kids to CPS. Unfortunately, we live in a society where if a parent spanks their fucker in public or even in front of a relative, there's a chance they will get investigated by CPS. A lot of idiots also believe all the stories online about how CPS will "kidnap" your children because you have one dirty dish in the sink and the kids wear hand-me-downs. So you've got people who want to whack the kid on the ass and are too scared to do so.
- Availability of medication. Why bother disciplining a kid when you can just doctor shop until someone drugs your kid up to his eyeballs to make him shut the hell up? I bet a lot of kids on tard pills are not actually tards - they're just undisciplined bastards.
- Tantrums are normal, a.k.a. the "Terrible Twos." I imagine some people figure the tantrums are a normal part of the growth process and just don't bother correcting the behavior. Even if the tantrums last all day long.
- Wanting "it all," as other folks have said. Breeders have this holly and jolly rose-colored vision of being parents where they can have kids, but also make absolutely no changes to their lives to accommodate those children. When Moo and Duh try to go out to eat with shrieking brats in tow, both are likely so burned out and sick of everything and everyone that they don't even bother trying to wrangle their brats. But they manage to find lots of energy if someone dares say a word to their brat or even look at it wrong.
I don't think tantrum-throwing kids are mentally ill. I just think they are so used to ruling the roost that anytime anyone tries to impose any form of structure on them, they can't deal with it. I was that way when I was a little kid; my grandmother wouldn't allow my mother to hit me when I misbehaved and I was a terror, especially in kindergarten. I kicked and punched students and adults, stole things from the classroom, screamed bloody murder when I didn't get what I wanted. I wasn't socialized very well because my mother preferred that I stay in the house all the time to decrease the chance of me getting into trouble, so I had almost no interaction with other kids (save for one cousin, and it wasn't frequently). Shit you not, my mother got a call from the principal at least twice a week my entire kindergarten year.
But my mother made up for what she couldn't do physically with verbal abuse, and despite being a spoiled brat, her constant screaming at me still causes me problems now. I don't think I'm sick in the head, but I do things like have nightmares where I wake up freaking out, thinking I forgot a homework assignment or missed class. Then I remember I'm not in school. I know that sounds silly, but these nightmares really frighten me because there was always hell to pay if I forgot shit as a kid.
Thankfully I mellowed out a LOT as I got older, maybe too much. Some people did tell my mother they thought I was an awwtard when I was in grade school because I wanted to draw instead of do work in study hall. Nooo, I just thought drawing was more fun than goddamn English homework. I think if I got smacked on the ass a few times, I'd have behaved more. But my mother was always wound so tight that if she had the chance to spank me, it may well have turned into physical abuse.
In short, I don't think bratty children are more likely to develop mental issues. I think they are more likely to grow up thinking their behavior is acceptable and continue throwing tantrums as they get older. These can be perceived as mental problems because teenagers aren't supposed to throw themselves on the floor screaming and shitting their pants when they can't have the last cookie. But it's a response they have learned is okay to do because no one ever told them to stop it.