Because we've just had the first collapse since 1855?
As a resident of the South West affected by this disruption I'd rather they spent hundreds of millions on something else. It's a kneejerk reaction. Dawlish does not close often.
I agree that decisions shouldn't be kneejerk, that decisions need to be based on some sort of benefit cost analysis & weighed up against other needy schemes.
I also agree with other posters that you cannot attribute individual storms to climate change.
But what is clear is that every year now we have record breaking storms - wettest december, windiest january, etc, etc. So the frequency and severity of major storms affecting rail infrastructure has increased/is increasing.
There is little merit getting into an argument here about whether climate change is man made, etc, etc. What is clear from evidence is that we get more severe storms more often than we used to, and it seems to be getting worse year on year in recent years.
Therefore we cannot make decisions about improving infrastructure resilience based on historic weather data back to 1855 any more than we can plan capacity for passenger data going back to 1855.
Predicting how much worse things are going to get is extremely difficult, but one thing is clear is that we are on a worsening trend for storms and we wont know for a long time if we've seen the worst of it yet.
Whilst there is a certain amount that can be done proactively from surveying, inevitably you don't always know your weak points until break. And to a degree perhaps, asking for cash for storm resilience is always harder than asking for money for other changes with more direct improvements to service, since the benefits of storm resilience work is much harder to quantify. I suspect a lot of improved spec for resilience happens as an add-on to other projects.
We should perhaps expect to see more of this sort of this sort of thing in the years ahead.
Sorry if that sounds a bit doom & gloom, but that's my (limited) understanding of the climate science & impact on infastructure.