DSM-IV used to have the label "substance-induced mood disorder". DSM-5 (and ICD-10) "substance-
/medication-induced bipolar disorder". They didn't just add "medication" because they love redundancy and created two labels for the substance-induced mood disorders (just) because they like additional labels: induced mania happens a lot and psychiatrists treated people with substance-induced BP and "normal" BP the same because (apparently) they're unable or unwilling to read and/or understand the DSM or at least unable to understand, it seems, that antidepressants are substances or that they might have given treatment that made things worse. It's probably beneath them because doctors always know best and never make mistakes.

So it's fine to call it BP (it's a syndrome), but the root cause is very different so the treatment should be very different.

Of course antidepressants are to blame for a lot of mania. But patients are often like doctors and don't admit it could be the result of a mistake. It creates uncertainty and shame.

People have to learn to live with uncertainty and the knowledge that they may have to admit they've caused their own problems, at least partially.

Even admitting that you can deal with depression with lots of effort is too much truth for many; what one does, thinks or experiences is completely unrelated to the (severity or) existence of one's problems, so one isn't in any way and to any extent responsible, many like to believe.