If the Delta Variant did not exist, it would be necessary to invent
100% right. The Delta variant was invented to explain why the vaccinated were still getting COVID. And because the booster is ment fight Delta but ut also it ment to weaken you even further, next comes the Lambda variant. Virus mutations hisorically become weaker not stronger. Its all a con.
You are 1/2 correct. Viruses mutate to become weaker and spread better. Delta meets both of those criteria.
The “Delta Variant” — someone’s been reading too many cheap espionage novels — also extends THE FEAR for a few months, when it was beginning to wane.