If BALPA's "fees" annoy you then don't pay them.
If everybody thinks like you and waits until "the others" join, then nobody will ever join.
If the pilots don't act to protect their interests, then it is absolutely certain that nobody else will.
This is not about you being persuaded by others, but about your attitude towards yourself, your colleagues and your future.
Finally, if Ryanair knew your identity they would "love bomb" you because of your "correct" way of thinking.
We are all adults and we have decisions to make. Yours, I suspect, will be different from mine.