This is easy. Because we have a well-established institutional hate for poor people. There is a subconscious belief that poor people are poor solely because of poor decisions. So, it's not our job to improve their lives. It would be 'unfair' for the rest of society to keep these 'freeloaders' afloat. /s
There's gonna be a lot of comments in here saying ^^ but unironically. It's just ingrained in the fabric of our society.