Yeah once you start using a vulnerability maliciously to obtain confidential data for your own personal gain, even if its a stupid vulnerability, you're not really good-guy security researcher anymore.
If all you did was the bare minimum to demonstrate the vuln exists, that's cool. If after you do that you continue to use it to obtain confidential info for your own gain or curiosity, that's not so cool.
> Perhaps it's more difficult to hold yourself accountable than it is to assume that others who've found your shoddy work are malicious actors.
You literally just admited to being a malicious actor in the paragraph above.