Maybe because it's not that simple? A new technology and a new infrastructure will be more expensive initially, until it reaches a critical mass. So, to reach t

Maybe because it's not that simple? A new technology and a new infrastructure will be more expensive initially, until it reaches a critical mass. So, to reach that critical mass you need early adopters who take the hit, and to help sweeten the hit, you give them money under the form of incentives to buy the new EV or create the charging infrastructure. That's one of the main duties of a welfare state.