You might as well argue why don't we get an October 1987 great storm felling millions of trees every year? These are exceptional events, what the Met Office like to call once in every 250 years. If they are correct East Anglia will get similarly flooded again in 2203.
However there is flooding there every year. While the Dutch prefer to build defences, we've used the cheaper option of deliberately breaking through the defences and opening up large tracts of former farmland for annual flooding, designating some as nature reserves, this to protect built up areas.
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Yes, but he made a good point. Unusual or not, the sea has never reached the same height as it did in 1963 in East Anglia. You'd expect that if it's rising a bit every year., the probability of getting the highest level increases, but probability seems to have been confounded. Also, talking heads are saying that climate change is making the weather more unstable, so, again, that should also increase the chance of an extreme event to cause the highest sea level.
As mentioned in one of those links above, various punters are noticing that many of the UK air temperature sensors have been moved from grassy areas to near buildings, roads and other concrete structures that would heat up the air around them, and another scientist involved in sea temperature measurement noticed that they changed the sensors to a different type, which read higher temperatures, but no allowance was made in the published data..
I'm not saying that there aren't rising seas or temperature, but I can see a lot of untrustworthy people bleating about it and aI have a lot of suspicion about the data collection methods and the way the data is reported. If it is what they say, there wouldn't be a need to use nefarious activities.