There was a popular science book a few years back Blink - Malcolm Gladwell... His central ideas were about this type of phenomena... We're reacting at a different level of processing..
And we often can't verbalise it, apart from 'I don't like this person' , or something about this situation is 'off'.
If it's not too dangerous (eg odd bloke on a dark Lane😱), I wait before acting on these 'feels', because often, in time, it will become evident.
For example, years ago, I was a new worker in a residential unit for young adults with profound LD....staff had loads of responsibility for daily stuff- the management was hands off on another site.
A long standing fellow worker... (5+ years)
All Id heard before I met him... 'Was, oh Steve's great, everyone loves him - he's so lovely'. Good with the clients etc etc...
So... I meet and work with 'Steve' the first time ... (we usually worked very long hours,with only 2 staff each shift eg 7am Saturday, 'til 10pm on Sunday (before laws changed.)
He was perfectly pleasant to me...but I was getting all the ringing alarms from my nervous system.. .
I was so disquietened by this, I remember telling a good pal, the day after.
This feeling didn't change and intensified over a good few weeks.
We had lots of control over substantial amounts of money coming into clients' bank accounts... paper records kept on site ... I noticed minor changes; unexplained discrepancies, the odd £10/20, here and there, but it was nearly always whole figures... But only when he was on duty... (not unusual to have several hundred pounds in the safe-this was 25 +years ago).
I mentioned it generally at a staff meeting... It was largely dismissed. 'one of those things, could be anything...'
So I went and met the off site boss... She was pretty dismissive of my concerns too.
We also had responsibility for stuff like taking out money so clients could buy clothes /items for themselves /going out /holiday monies...
Some of the expenditure for the person he key worked... Just didn't make sense. Eg £400 for items such as stereo/nice bed stuff and some records... That was all accounted for in his handwriting...
None of these items appeared/could be found ... Usually it would be completely evident... As they'd obviously be in the person's room. (none of the residents had any language /makoton/cognitive ability to say. )
So I had solid evidence. I went to a different boss... Knowing that if they acted on this... I'd be the obvious whistle-blower....
(he had lots of loyal friends in the wider team...)
So the long and the short of it?
This 'lovely', utterly disgusting man, had been stealing money for YEARS from these vulnerable clients, once they had forensic book keepers go through everything, he'd been doing this within a few weeks of starting .... He was eventually suspended /sacked.
It was many many thousands of pounds he'd defrauded from this vulnerable client group.
He was prosecuted.the boss made sure all the local care places knew his name (pre DBS type stuff).
The bloke is still around the local town.
Utter psychopath... Noticed in local paper he'd married into a rich local family.