Baby around large dogs?

How do you feel about your newborn or toddler being around big or dog breeds that are known to be aggressive. Do you think that people who have large breeds with little ones are irresponsible? I’ve seen so many bad stories lately of family dogs attacking kids and it really saddens me. I’m not judging anyone with large breeds I just want to know everyone’s opinion, but I personally wouldn’t want my baby around an aggressive breed imo not to bash anyone who does just my personal preference. Also what do you think cause a dog who has been with a family for so long to snap and assault a loved one?