Lol you obviously don't fish the A-Rig, doubles aren't common on the rig, many people have been fishing the A-rig for a long time and have never doubled up. The main argument for why the A-rig should be banned is mostly the fact that on TV dragging up fish with 3 hooks stuck in their side can look bad. (I personally don't care if its banned or not, doesn't effect my fishing lol.)
And I don't wanna be "that guy" but there are already a lot of good threads on this worth reading if your interested in the topic.
I'll add one more thing, FLW did a survey and the majority of professionals did not like the Alabama rig being used in tournaments, so them banning it pleases the majority of pros.