You're not the ONLY influence, but you are AN influence. And arguably the primary one. At some point you gotta stop blaming the billboard you pass by everyday and actually parent. Which is about guiding, not bounding your kids.

your fear as a parent shouldnt be them watching some raunchy YT video and falling into the wrong crowd. By that point you should trust your kid enough to know that that raunchy video isn't reality and to focus on what really matters. If your kid isnt at that point, well: you gotta do more guiding.

Don't' just give up and blame society. Get them the help they need if you can't provide it