It's a little convenient, isn't it, to say that the reason you did something horrible was because someone else told you to. That doesn't make it any less wrong. No matter how many people are telling you to jump off a bridge, you always have the option to turn around and walk away.
The quote emphasizes personal responsibility in the face of outside influence. It suggests that blaming others for one's actions, especially when those actions are harmful, is a convenient but flawed excuse. Individuals always have the choice to refuse to comply with harmful suggestions or demands. This highlights the importance of accountability for one's decisions, regardless of external pressure.
By using the metaphor of jumping off a bridge, the author underscores the idea that one can always choose to resist negative influences. Just because others may advocate for a certain action does not absolve a person of their moral responsibility. Ultimately, it reinforces the belief that individuals must remain true to their own values and ethics, regardless of external circumstances.