What is the purpose of the 5th precept? “Furthermore, abandoning the use of intoxicants, the disciple of the noble ones abstains from taking intoxicants. In doing so, he gives freedom from danger, freedom from animosity, freedom from oppression to limitless numbers of beings.”

To be clear, I am trying to figure out the spirit behind the 5th precept. To see how far it spans and what exactly constitutes intoxication.

To dispel any doubt about his reasons for prescribing this precept, the Buddha has written the explanation into the rule itself: one is to refrain from the use of intoxicating drinks and drugs because they are the cause of heedlessness (pamada). Heedlessness means moral recklessness, disregard for the bounds between right and wrong. It is the loss of heedfulness (appamada), moral scrupulousness based on a keen perception of the dangers in unwholesome states. Heedfulness is the keynote of the Buddhist path, &quot;the way to the Deathless,&quot; running through all three stages of the path: morality, concentration, and wisdom. To indulge in intoxicating drinks is to risk falling away from each stage. The use of alcohol blunts the sense of shame and moral dread and thus leads almost inevitably to a breach of the other precepts. One addicted to liquor will have little hesitation to lie or steal, will lose all sense of sexual decency, and may easily be provoked even to murder. Hard statistics clearly confirm the close connection between the use of alcohol and violent crime, not to speak of traffic accidents, occupational hazards, and disharmony within the home. Alcoholism is indeed a most costly burden on the whole society.
-- A Discipline of Sobriety (by
Bhikkhu Bodhi)

Where do addictions enter the equation? Drugs other then alcohol?
These do not seem to be covered by the explanation (assuming the claim is true, which I do not know of).
What about intoxicating love? Where do we draw the line between lust and intoxication?
What about intoxication and ignorance? Is there even a difference?
Thank you
The 5th precept is not about addictions. It is referring to taking substances that lead to heedlessness, whether you get addicted to it or not.

Love/sexual misbehavior is covered under the 3rd precept. Again, it's not about addiction.

The intoxication discussed under the 5th precept is chemically muddling your senses. Especially the mind. Ignorance plays a role in wanting to do that. Once you are intoxicated, it leads to more ignorant acts.