Again, I didn’t see the film, but it sounds to me like communication breakdown. Who bought the plastic in the first place? I’m a great believer in reusing stuff. You did not know how harmful plastic is, fine, now you know and won’t buy new plastic toys, but there’s no point throwing them away when a kid can still play with them. Does it make sense?
If they’re beyond repair, recycle them (although most plastic toys don’t get recycled), or give them to someone who has some interesting upcycling ideas.
Good to know that some big toy companies are planning to change their ways. Lego, for instance, wants to use only plant-based materials in the near future.
I know parents who only buy sustainable toys or make the toys together with the kids (now that sounds like fun!). I’ll ask them for some tips.