I'm no fan of the halo at all, but that's purely from an aesthetic point of view. It is just a bolt on as there was clearly no consideration to wider regulations and restrictions to allow a safety device to be better incorporated into car design. However, improving safety is important, more important than aesthetics and that's why I've grudgingly accepted it this season. Stating that I hate how it looks doesn't mean I don't value the contribution it makes from a safety perspective, and I think there have probably been at least two really good examples this year where it made an important contribution to driver safety.
However, that doesn't mean that it is perfect, and this last race delivered a good example of a fairly fundamental flaw. I was thinking how this situation would have ended if it had been in a gravel trap instead, with the halo and the drivers head possibly effectively dug in and buried in the kitty litter.