Why do some feel the need to "prove their love?"

I wonder why it is that people blog or tweet or post or even say things like, "I love my boyfriend/girlfriend," or "I love my kids," or even, "Don't nobody better (<--vernacular, as this is how most say it) mess with my kids. I'll kill someone over my kids." I mean, aren't these things pretty much accepted as truths without the need to emphasize them? Is it just me, or is this grating on one's overall tolerance of the obvious? It's not me, is it? It's them. And while I'm on it, stop with the "LOL" after every sentence already. "Hi, my name's Sally lol. I have to work outside today in this 99 degree heat lol. I had a heat stroke last week lol." Am I becoming more cynical of human beings as whole as time goes by, or are people really becoming more irritating? That question shall remain rhetorical.