When the indian government increased the prices on petrol and diesel in September 2017, national television channels like times now protested against the move , however the indian government and minister said that those who own a vehicle like a car or scooter are usually wealthy enough to pay a small amount as additional taxes.
A car or other vehicle is fairly expensive, is a depreciating asset unlike real estate and there are other expenses related to owning a car like insurance and maintenance expenses which vehicle owners are aware of before purchasing the vehicle, A person who is not making much money will not purchase a vehicle, they will walk or use public transport to reduce expenses whenever possible.
So only those who are well off, can afford to purchase a car or other vehicle and can easily afford to pay the additional amount as taxes as the prices of diesel and petrol are also increasing internationally