Food Recalls

Why are there so many food recalls in recent years? Did this happen in the 80's and 90's and I just didn't know about it(ie my parents were buying my food and making sure my eggs weren't trying to kill me?) There's a new recall that I saw today where there are shards of glass in frozen veggies. Seriously? How does that even happen? Pretty sure I don't want to know, nor do I want to know what goes in the food that they don't catch and ask for a recall.