You can’t tell when your kid is
lying. Data taken from more than
10,000 instances show adults
could only tell when kids were
lying 47% of the time,
which is no better than
if they had just guessed. Source
Stan had a hard time lying to kids’ faces outright. He had a lot of practice with Soos (who at first after growing fond to him, he found it hard to lie to) which is why he can lie to Dipper and Mabel so easily.
The most dangerous thing they did to us - they disabled us from reacting. They gaslighted us into doubting if we were even abused, making us a mess with our own thoughts and feelings and guilt so they were able to do anything - and we couldn’t react. We couldn’t defend.