One event shouldn't spark such stupid rules as a control tyre.
Eh?

Isnt this about Michelin being snubbed? They go from total supply to losing the contract for the supply?

Control tyres RARELY have safety issues. Theyre usually that far back in development sense that theres very little risk of anything negative happening. That and the lower cost (due largely to the lack of development) will be the main reasons why theyve gone that direction for both F1 and WRC now.