You are joking, right? Possibly trolling?
First, there are two examples in my post (the second video from iran, you have to follow the link) Google "daycare abuse" and you will find at least 5 million hits on the subject, more articles then you might care to read, and more videos then you might care to watch. And these are merely the documented cases. Imagine how much goes on that never gets recorded or reported. Physical abuse, sexual abuse, and overall neglect run rampant in these facilities.
What this has to do with all daycare is the fact that with daycare, you are placing your vulnerable, young, developing child into contact with other children AND adults all coming from different histories. Some of those histories may be healthy, others may not. Thus, your child will observe and possibly imitate, or be subject to, any number of unhealthy behaviors that could possibly put the child at risk in the short term, and without a doubt affect behavioral development in the long term.
And all for what? So a parent can work more and spend less time with the child? Does the thought of other people raising and possibly harming your child during the child's most critical stages of development sound like a good idea to you?