Doesn't it all boil down to this:
Don't fly in or near Thunderstorms of any size, EVER.
It seems to be the case that every few years we lose a plane to the weather, we wonder why it keeps happening.
Don't get near them, they will kill you and your passengers.
We know better. We know better. But why do we keep forgetting?
Why? Do we think the technology gets better and that makes it ok? Do we think the planes are better and that makes it ok? Well, it doesn't.
Don't fly in or near Thunderstorms, EVER. Legislatures around the world should make pilot pushing illegal, punishable by monetary reward to any pilot that turns back, doesn't take off or otherwise EXERCISES his authority to avoid unsafe conditions for the flight he commands.