I'd have thought a wider tyre has (slightly) more chance of picking up sharp debris.
I though the same too, but thinking back I realise I get punctured with high pressure skinny tyres, but less so with bigger tyres at lower pressure.
Most noticeably the Schwable Fat Frank tyres at 2.35 (60c), it's puncture protection is lacklustre when compared to says, a Marathon Plus, but it still held fine despite going through several derbis and broken glasses that could easily write off a skinny tyres.
I though the same too, but thinking back I realise I get punctured with high pressure skinny tyres, but less so with bigger tyres at lower pressure.
Most noticeably the Schwable Fat Frank tyres at 2.35 (60c), it's puncture protection is lacklustre when compared to says, a Marathon Plus, but it still held fine despite going through several derbis and broken glasses that could easily write off a skinny tyres.