Like most all of logic, fallacies do not mean wrong. They are just not a valid argument. Sometimes they arise from simplification. For example “if guns are made illegal then only criminals will have guns” is often sighted for tautological reasoning and justly so because as it stands it is just repeating itself. Because yes if guns are made illegal then the act of owning a gun would be illegal which would make one a criminal. The slogan though is trying to convey that if guns are illegal then people who are criminals already for other reasons are more likely to find breaking the law in order to have a gun as being a palatable thing to do as opposed to someone who is law abiding and does not want to break the law by owning one. Therefor the law makes them vulnerable to people who would take advantage of this vulnerability. Taking the slogan and saying thats tautological goodbye is lazyness. Saying its tautological and you expect them to bring more to the argument is more sincere to me. So someone using a fallacy is not endgame with me. It is only if they repeat them and lean on them and refuse to get why they are fallacies that I might just stop talking with them.