I think #1 and #2 have been around since the beginning of time. People can, by nature, be selfish. It sucks but that's the reality. I can't speak to #3.

For #4 I just think it's the decline of decency in society as we know it. Everything these days is about "likes", "followers", "subscribers", etc. Social media has created this monster and it's only getting worse. The bullying and shaming in presumed anonymity give cowards the "courage" to say things they would never dream of saying in person.

The Internet is great for communicating, research, and learning but, humans being humans, we found a way to even screw that up.