Blinky it's probably because you're still young and new to alcohol...once you've taken Mr. Alky's Wild Ride for many years, it will become glaringly obvious that Kava is the better drug and superior experience. Also, if you're having a hard time getting through kava's "reverse tolerance" and aren't getting good consistent effects yet, alcohol can have a certain appeal for it's guaranteed effectiveness.
In my 20's I could never drink kava for more than a few weeks at a time. There was just too much stuff to do that doesn't suit the kava experience...bars, concerts, nightclubs, raves, parties, out late, all over the place etc...
All that stuff is better suited toward alcohol. But when that period of life comes to an end, you'll still be accustomed to that same level and frequency of drinking...everything about it gets worse, it becomes less enjoyable (then you drink more), your body can't handle it as well, the health consequences start becoming more apparent, sloppiness increases, generally all the negatives become the most prominent aspect...but because of the nature of addiction, your mind will still say...ehh just drink more you'll be fine.
When I look at what happened to all my friends who drank hard and never gave it up (most of them), it becomes obvious that all the negative things you hear about alcohol are very true. Some have had withdrawal seizures while sleeping(more than once), blood pressure spiking near stroke-level, multiple DUI's, car wrecks, violence, classic alcoholic marital issues, endless unreasonable arguments, increased blackout occurrence, rehab, AA, relapse and a doctor visit would surely show many other physical problems.
The fact that kava is effective and enjoyable for both recreational and medicinal uses, while being relatively harmless to the body and completely free of physical addiction makes it clearly one of, if not the best drugs to ever exist. Add to that, that it doesn't negatively effect your behavior or thought process and if anything it slightly increases empathy.