Yes, and everyone thinks they're a great judge of character and integrity and they won't get backstabbed. Just the unenlightened and unwashed masses around them who don't know how to really look at a person and determine how trustworthy they are.
Then life goes on and someone who they thought was decent goes through a difficult time in life and backstabs them.
Even ignoring the very simple fact that people do change, there's the undeniable fact that the circumstances around a person change and it can and does push people to do things that they typically wouldn't do.
People who've lived comfortable lives and never had money troubles think they'll always be fine, but the minute their finances take a slight dip, they panic. It's a problem they never expected and it's probable they'll make some irrational decisions. Or maybe that person you've trusted all your life found out their brother has cancer and they're desperate to do anything to pay for the bills.
Shit happens. People try to adapt to it however they can. Thinking you'll avoid problems just by judging their integrity with a firm handshake and getting to know them is setting yourself up to be screwed over by people who know how to find an easy target, if not setting yourself up to be one of those virtuous people who screws over other people because your motives are good and theirs aren't.
Integrity, like any human characteristic, is a distribution; some people have more of it than others. If you just view everybody as the same, you're more likely to end up with somebody with average integrity, as opposed to if you actively searched for people displaying greater integrity. Similarly, assessing people is a skill that varies greatly among people, and if you just take the view that everybody is the same at it, you'll have no motivation to develop that skill yourself.
Then life goes on and someone who they thought was decent goes through a difficult time in life and backstabs them.
Even ignoring the very simple fact that people do change, there's the undeniable fact that the circumstances around a person change and it can and does push people to do things that they typically wouldn't do.
People who've lived comfortable lives and never had money troubles think they'll always be fine, but the minute their finances take a slight dip, they panic. It's a problem they never expected and it's probable they'll make some irrational decisions. Or maybe that person you've trusted all your life found out their brother has cancer and they're desperate to do anything to pay for the bills.
Shit happens. People try to adapt to it however they can. Thinking you'll avoid problems just by judging their integrity with a firm handshake and getting to know them is setting yourself up to be screwed over by people who know how to find an easy target, if not setting yourself up to be one of those virtuous people who screws over other people because your motives are good and theirs aren't.