Sanctions prohibit transactions with specific companies, banks, and a few other entities. They actually make a lot of economic sense, as they are designed to weaken the parts of the economy used to fund the Russian warfare.
Sanctions against private citizens in Russia would tangentially contribute by reducing the cash flow inside the country.
Targeting random people that are actually trying to leave the country is like what? You expect them to instead go take pitchforks and storm Putin's bunker? Or kill themselves out of shame? More likely, they'll find whatever employment there is inside the country and pays well, and chances are, it will be closely related to the Russian government.
Sanctions against private citizens in Russia would tangentially contribute by reducing the cash flow inside the country.
Targeting random people that are actually trying to leave the country is like what? You expect them to instead go take pitchforks and storm Putin's bunker? Or kill themselves out of shame? More likely, they'll find whatever employment there is inside the country and pays well, and chances are, it will be closely related to the Russian government.