Until the use of private aviation is restricted, everything else is just peeing in the wind.
I most definitely agree with you.
Whilst private jets are much more polluting per passenger and are seeing increases much faster than commercial aviation, in Mt. values it's quite small:
- all aviation (2019 peak) 1,000 Mt.
- private jets (2023, as it has grown by 46% since 2019) 16 Mt.
To put worldwide private jets into into a UK context, when Drax gets turned off that's 11 Mt. of carbon no longer being emitted (although it's argued that it's recent carbon, however it's still an emission) or decarbonising the waste sector (19 Mt.).
Hardly "pissing in the wind" numbers, although there will be a need to limit the growth, as if it were to double then that could be an issue.
However, again context could be key. If private jets emissions double (+16Mt.) because commercial airlines cut routes by 3% (-30Mt.) and so those who "have" to fly swap but far more go by train instead then the overall impact is lower global emissions.
For example, the fact that a private jetis up to 15 times worsethan a commercial airline means that even if a flight taking 60 people was cut and 3 then used private jets the total emissions would still be lower (it's why the argument against a French type ban based on train journey time of "but people will just use private jets' is a weak one, as virtually everyone will just swap to rail).
Also, in the context of this thread, it can come across as "I'm not as bad as others, so I'm fine".
When in the context of the number of air passengers in the UK is around 1 per person of population, then anyone taking 2 return trips by air is already four times higher than the average person (and even then that's including people flying to the UK to see people, so in terms of UK residents' flight numbers it's even worse).
The whole thing with emissions is that anything extra is bad. It's why comparisons between cars and trains are poor, in that the car is always extra emissions.
Likewise, comparing Voyager with a passenger jet, in that the comparison is between the worst of the railways (and many would argue is due a replacement in the near future) with the best of aviation (where it's far harder to decarbonise much more in any reasonable timeline, other than to withdraw services).
To give an example of this, the main reason we have such a green grid isn't entirely down to renewables, a lot is down to significantly less electricity being used even with a larger population and smaller average household sizes (on a per household basis we use less electricity and gas now with all our tech, including some electric cars, than we did in 1980).
Back when Richard Desmond owned his newspaper and magazine empire, one of the sales reps used to fly around the globe one flight ahead of him, and placing copies of OK! Magazine in arrival airports to give him the impression that his products were globally available. Said rep got the full glove treatment a couple of times, as he always flew with carry on only (and straight back again the same day), and the majority of the contents of his bag was a bundle of magazines that he’d deliver to the shop(s) at the destination airport 
