Whilst I entirely agree with your overearching argument here, perhaps you are being a little bit snobby when it comes to SPLs.

Can you please be more specific with regards to the necessary skills that sport pilots haven't gained that you believe makes them a liability in the skies?

Lets be real: plenty of VFR private pilots are threats in the air & garbage on the radio - especially at untowered fields. You should be judging pilots on an individual basis, rather than broadly assuming a lack of knowledge based on their certificate type, given that the syallabus (61.105 & 61.309 + 61.325) is more-or-less identical.

edit 2 min later: I see your response to another user now.