When was the last time Bitcoin had an emergency hard fork?
Doesn't mean we won't need it in the future. What if we need one?
There has never been an emergency hardfork on Bitcoin.
For an emergency hardfork to happen on Bitcoin, would require an existential threat to the network. In those circumstances you better shut your channels right smart.
If the hard fork destroys the lighting network and you cannot close your channels in time, tough shit. The integrity of main net takes precedence and everyone knows it. Maybe you will lose your coins locked to lightning, maybe the person who gets them will be honourable and return them, maybe the hard fork will force close channels. Who knows. Lightning is intended for low value, high volume payments. It is not intended to be as secure as main net.
Security is expensive, horrifically so in a decentralised context. If you want strong security, don't put anything on lighting.
Keep in mind we are talking about a very low probability event. Bitcoin is riddled with low probability events that could destroy it. Quantum computing, global government ban, SHA-256 is broken, all intel/amd processors get backdoored etc etc.