Civil conflict in a modern developed society is much more likely to be carried on with information than with guns—a government that wants to oppress its population does it by controlling what people say and know. It follows, in my view, that the modern equivalent of the Second Amendment, the legal rule needed to make it possible for the population to resist the government, has nothing to do with firearms. The 21st century version would be a rule forbidding government regulation of encryption. A government that has no way of knowing what who is saying to whom lacks the most powerful weapons for winning an information war.
Each of the two types of meditation is useful for a particular reason. The passive meditation involving the clearing of the mind, the emptying of the mental jumble which is characteristic of mind complex activity among your peoples, is efficacious for those whose goal is to achieve an inner silence as a base from which to listen to the Creator. This is an useful and helpful tool and is by far the most generally useful type of meditation as opposed to contemplation or prayer.
The type of meditation which may be called visualization has as its goal not that which is contained in the meditation itself. Visualization is the tool of the adept. Those who learn to hold visual images in mind are developing an inner concentrative power that can transcend boredom and discomfort. When this ability has become crystallized in an adept the adept may then do polarizing in consciousness without external action which can affect the planetary consciousness. This is the reason for existence of the so-called White Magician. Only those wishing to pursue the conscious raising of planetary vibration will find visualization to be a particularly satisfying type of meditation.
Contemplation or the consideration in a meditative state of an inspiring image or text is extremely useful also among your peoples, and the faculty of will called praying is also of a potentially helpful nature. Whether it is indeed an helpful activity depends quite totally upon the intentions and objects of the one who prays.