Young Celebs: Marriage a trend?

So recently i heard about Miley Cyrus's engagement, apparently it's quite a big news- it's on yahoo, magazines, forums..... Which brings me to this question: Why are people getting married so early?
Don't forget Miley is just 19 and there's plenty more of young celebs who are married and engage or pregnant e.g Hilary Duff, Macaulay Culkin, Avril Lavigne, Jessica Simpson, Britney Spears etc
My point is here, are these people really ready for marriage? They think it's easy to maintain it and look what happened? except Hilary Duff the rest all got divorced. Sure, it's easy getting into a marriage AND a divorce in Hollywood especially if you're a celeb and you're loaded.
I think because of these people, the word marriage isn't significant anymore. It's no longer the beautiful thing that means spending a lifetime with the one you love. Now it just means, dates-to-functions and sex-partners-legally-till-we-get-sick-of-each-other. They think being 19-24 is considered matured adults and they have what it takes to get married. Wrong! Research has already proven while you're biologically capable and physically able to marry, you're brains are still WAY too young for this kind of responsibility. Young celebs nowadays think it's sorta like a trend to get pregnant and married young. Well, it's one of those stupid trends like planking or impractical high heels. They think that they just gotta have it like the latest CD or designer dress. Even if you dress like a matured woman while walking down the red carpet, you're still intellectually childish for marriage which requires a lot of responsibility. And i don't just mean the celebs, i mean the entire human race.
So i am appalled get it? DISGUSTED when their parents are saying things like they're happy for their kids. It's not encouraging them into a happy life, it's more like sending them straight into the depth of an unhappy marriage. While i understand some pregnant teens who had to get married for the sake of their child, they also need to be ready to take up full responsibility as a mother and wife.
I am sceptical that a union between Liam Hemsworth and Miley Cyrus is a good thing. My opinion, it'll turn out to be just like another Kim Kardashian case and i won't be surprise Miley will turn out to be one of those Real Housewives in the future who will be cursing and having cat-fights with other ladies on national TV. Don't forget this is the same girl that sang "Can't be tamed". If Liam thinks he's capable of taming this girl? be my guest. But i would be there to laugh and say :"I told you so" if it turns out just the way i said. Or maybe he's just jealous his brother is happily married to Elsa Pataky and they have a adorable girl and Liam wants to have it too? Well, it's one thing to be married to Elsa Pataky and entirely another thing to be married to Miley Cyrus. One's already old and matured enough to think rationally and the other is too young to think of the future consequences. When the passion and love is gone. you'll expect a split alright. And for someone like Miley, i'd expect her thrill to run out soon. But hey, whatever floats your boat~~ 
A real genuine question to Liam: Are you sure you wanna do this?