Why are cars getting bigger?

Why are cars getting increasingly bigger? What used to be small cars for example Nissan Micra, Ford Fiesta even the MINI are huge compared to their previous versions. In a congested part of the world like Western Europe, You see so many large cars usually only with 1 person in them (the driver) why are governments and car manufacturers alike not pushing to make small cars more of the norm? 1 or 2 seater cars. Similar to a SMART CAR, which i think is perfect for today's world. You can fit 2 smart cars in a parking space designed for 1 normal size car.

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