Those of you who say you've been not washing for 50 years and are fine, well that's just pure luck. Random. It's the same as saying you've smoked for 60 years and never got cancer. Some people won't, but in GENERAL the risk is there.
There are two sides to this: it's been found that ingesting some dirt as found on home-grown veg (not fertilised with animal manure) can be healthy and protect against allergies etc. and also give you some vital minerals (selenium) found in soil. I'd not be fussed about carefully washing carrots, beetroots, lettuce etc grown by myself when I know where they have been grown and in what.
However, I feel very different about bagged salad which is notorious for harbouring bacteria, or fruit that's travelled across the world and been handled by numerous people in numerous countries en route to the UK.
I am also not sure about the hygiene regulations in other countries, especially those where the pickers use the fields to defecate, have no loo paper, so your produce may be contaminated with all kinds of dangerous bacteria.
The use of safe pesticides varies across the world, so that's another issue.
As a PP said, you don't know about the accumulation of pesticides that are inside you now. Yes, washing helps remove them and things like leafy veg are the most risky. I've walked alongside tractors spraying fields and believe me, they get a good dousing several times a year.
Not washing is playing Russian roulette. You've been lucky so far- stomach acid kills bugs a lot of the time - but there will be a day when your luck runs out. It's not worth risking.