its delusional to think that by careful driving you can avoid the possibility to roll a car.
We all have different views on risk and safety, and the 'right' decision about what is or is not 'safe' is an intensely personal one.
If you want a roll bar and can find one to suit your needs, then go for it. Heaven forbid you should ever need it. Personally I've not seen an arrangement that I'd be happy to use without a 4-point harness.
