So suppose a small guy (like me), 5 feet 8 inches tall, 140 lbs, comes up to you and say "Aikido is all BS". How would you convince me otherwise?
I wouldn't, because you wouldn't. Come up to me out of the blue and start spouting, that is. We have a name for people like that around here: we call them "street crazies", and if you've lived in a city, you can spot 'em and do the swerve and leave 'em explaining their conspiracy theory to the air.