BTC is now a digital core asset.

Saw in some posts that large mining pools now control mining and they ensure 50% + attack not happening.

1.)As a matter of risk mitigation,if some government/non government  hackers cut of mining pools from network  through internet disruption
2.)Physical shutdown by fraud/insider work
3.)natural calamity like earthquake.

How BTC network manage 50% + attack?

I am sure  these scenarios are well taken care.
Can some one throw light on this dark topic?