It is ultimately down to education. In the days when we had a bit more flexibility over MORS a chat over the phone usually sorted out any issues and most VFR PPLs were horrified to think that they may have in anyway caused any problems.
The time the average student gets in the classroom to fully understand the implications of flying close to an IAP outside CAS without speaking to ATC or keeping a reasonable distance is extremely limited. I have advocated before a ground school for the PPL where ATC also get involved, with no subject taboo. Ultimately of course though money dictates everything these days.
Prior to my enforced absence from work i ran regular trips around my ATC unit and trips to D&D, when I am back in harness I will do them again. Once most have seen a busy Radar display they don't forget it and hopefully also this barrier which some create in their mind between ATC and Private flyers disappears.