> "Malo periculosam, libertatem quam quietam servitutem."

malo ... quam ... ⇒ I prefer ... to ...

Preferring what to what? This is why all other words are in accusative singular as simple enumeration:

periculosam ⇒ dangerousness

libertatem ⇒ freedom

quietam ⇒ quietness

servitutem ⇒ slavery

Hence I would take his statement as: "I prefer dangerousness and freedom to quietness and slavery."