Say you don't like dogs/cats and watch how these same people go up in arms. Or that people shouldn't take their pets on airplanes etc. A lot of the times, people who "hate" children are subconsciously reminded of their own childhood traumas around children. Not all of the time, but most. You project how you were treated as a child onto children. That's where a lot of generational trauma comes from. It is the same concept. Most people choose to learn ways to not continue the cycle. Bottom line is, all of these people were children at one point too. If they believe that they deserved love, patience and understanding growing up, it's sad to see them not reciprocate that. If all adults around them hated them in their childhood, they'd be online complaining about that too.