Yeah I believe this to be a fallacy. If all your contacts use WhatsApp, they still haven't grasped the concept of installing two applications side-by-side. Or they don't fully understand why people are using signal over WhatsApp. If you fail both of those, congratulations, you've failed to be a self-aware tech user and you're now demoted to a braindead consumer.

I know, mind blowing right? Point is, society in general should not accept others forcing you to keep the WhatsApp monopoly in tact, which is exactly what's happening here.

It will take some time but eventually adoption will spread, even among your contacts. It's just a matter of critical mass, and there are some pretty compelling features within Signal that make it a worthy replacement.