The difference with Tesla and other EVs is the battery is extremely expensive. The average risk may be lower but if you do happen to get unlucky and have your battery fail the cost is going to be massive to fix. With a traditional ICE car there doesn't exist a single part in the car that costs $15,000.
Your next post says that well if it were to happen you've now paid $35,000 for a car with a newer battery which increases its value. True, that may be the case, but it hasn't increased the value more than it cost to fix, plus how many people buying $20,000 cars have another $15,000 that they can just throw down without notice?
There is basically no way your $20,000 used ICE ends up costing $35,000 a year later.