You wouldn't remain a leader for long with that attitude. It depends what society you'd try to rule. In Europe people would throw eggs at you and then molotovs, in Africa the crowd would drag you out and butcher.
Who would you force to gas your citizens? The army? The soldiers have families too and soon you'd have mutinies, deserters and armed uprisings.

If I were the leader I'd aim to decrease taxes and completely remove income tax. I'd impose a single, equal tax on every citizen that, similar to property tax.
I'd stop forcing people to pay social security and allow them to do what they want with their money. I'd reduce the number of MP's and their wages to 2x the average wage. I'd also cut the wages of CEO's of companies owned by the state at least by half. I'd turn the army into a small very well trained and armed and paid group that would consist of not more than 10k soldiers, but soldiers that are masters in their craft.

There are many things I'd do, but to be able to do it I'd need an absolute power, otherwise it would take years to make those old farts senators agree on anything.