Leading definitions

These annoy me... the conversation goes something like this (substitute in any topic you like)
example -
1)"attacking soccer teams" are better than those that are good defenders.
how can you say that?
- because attacking teams are also good defenders
some are not...
- That’s a third category "stupid teams".
really?
- Therefore attack is better than defense
??

One of the problems is that it isn’t just average people who use these tools – academics and politicians use them constantly in a sort of battle to define the language in such a way as to "prove" their point...