Where oh where did you find these 'liberals'? Leave people alone? Liberals??? Never!
Liberals are the utmost advocates of paternalistic, nannying, big government intrusiveness. They don't want you to smoke, drink, etc... They want helmet laws, seatbelt laws, now they even want food laws.
The very essence of socialism is that people cannot care for themselves, and individuals owe others something, and must give up their rights and income for 'the greater good'. There is no 'leave people alone' in that equation.
The essence of socialism is covetness. It is a symbiotic covetness - those who covet the wealth and comfort that is not their's to have and those who covet the power to take and distribute that wealth and comfort which is not theirs to take. "Thou shall not covet" is the tenth commandment. And some idiots want to remove the ten commandments from the courts and the public. It is amazing that such an ancient wisdom could be so acutely applicable today.
What the Libertarians and Liberals have in common, among other things, is a hijacking of the concept of individual rights while dispensing with the belief system that formulated such rights.
Without the Creator (of Rights), you just have a hugfest of animal-humans who make up the rules as they go along while pretending that they are extra-special than any other animal. I now have a right to to kill fetuses...because I said so, now leave me alone...Gays have a right to marriage...because I said so, now leave me alone...Minorites are downtrodden...and deserve special treatment...because I said so, now leave me alone...