They're interested in making money, not providing a social service. There's certainly a problem there, but it's not the VCs' responsibility.
You are more likely to succeed in your business if you have the experience of building scalable systems, like at google, and if you have a similar friend group to recruit talent from, which is extremely hard at an early startup unless you already know the kinds of people you disproportionately meet at top universities and tech companies, and if you have family/friends that can help you out while you're struggling at the beginning of the startup, etc.
You are less likely to succeed if you have the financial encumberances that are common outside of the upper middle class, or if you have an unstable family structure that leans weight on you, if you don't have a safety net to lean on to get you through rough periods without personal income, and if you don't have the kind of network that a top school, top company, or connected family brings.
I came from a working class background, taught myself how to build products, made my own connections and raised some money for a startup and had to leave and return the money because there was a nonzero chance I'd have to adopt my nephew to keep him from the foster system, and couldn't possibly do that with the hours and volatility of that game. It is perfectly logical to avoid startups that have those kinds of additional risks when the game is already risky.
We absolutely should try to assuage those biases to improve economic mobility, but the answer isn't just to yell at VCs for trying to make money.