If you actually cared about hygiene you'd be using something like wet-naps, since bidet nozzles aren't sanitary (would you rinse your mouth with a bidet nozzle?)
- Fatbergs ( danger in flushing them )
- Hands touching excrement, then you touching other surfaces.
- No, an active nozzle can't get soiled the way you think. This is almost akin to thinking that a faucet can get dirty. The force of flow is a LOT larger than projectile acceleration no matter how bad those tacos where. In any case, most bidets have self cleaning, and anti microbial surfaces.
But sure, keep on smelling. it's your choice after all.