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They must be thinking that our body is like a municipal water system. The water is usually kept at high pressure so that if there's a leak or rupture, the water will gush out violently enough to prevent anything from contaminating the system for everyone else.
The key thing they're missing though is gushing violently. The body generally doesn't bleed vigorously enough to prevent foreign agents from getting in -- and most of the time when it does, you're having severe blood loss.
The only exception I think is around the anus. If you've had hemorrhoids you've seen just how much they can bleed, and I think that's to generally keep things out since it's an unclean area. Still, if you sat down with a bleeding ass in contaminated water, you're still going to get infected.
Still, if you sat down with a bleeding ass in contaminated water, you’re still going to get infected.
Not to mention... sharks!
Hypertension special secret capability unlocked: infection invulnerability!