IMHO, RFT tyre with bulge may be will blowout like non-RFT, but you wont loss control due to the stiff sidewall that still able to support your car. My last RFT tyre, before i changed them, it has bulge and even puncture, but i still manage to drive about 100KM, then only send to tyre shop for new tyres.
Last week, my friend new A6 with non-RFT, someone purposely cut 3 tyres, 1 of the tyre blowout when he cruising in LDP, very lucky he still managed to stop, and send the car to nearest tyre shop. RFT can save your life when blowout or someone 'aim' you or your car....