Horrible people

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Why am I seeing so many people being so harsh to others? I saw one post and a girl was begging for help because she'd cheated (and regretted it) - all people could do was tell her that she was a 'whore' and 'not worthy of a decent man'. Another post in which someone was in love with a married man and everyone was calling her a home wrecker (they hadn't even done anything together and he didn't even like her back). Another post where someone asked for help as they'd just got their first ever period and people were telling her that she was 'too young to even be on the app'. 
I'm surprised that people are so harsh. If someone asks for help, HELP THEM. Don't criticise and insult them. If you don't have anything nice to say, don't say anything at all.