It only takes one disrupter to up set the rest. I have had my share of trouble in the house.. things seems to work out with time and management. I'm always trying to make every cat feel comfortable.. They need outlets for their energy . Especially when young. I would supply them with boxes and rearrange them different everyday also they love paper bags.. But I'm sure you know all this..Buit you are right ..counter productive to yell at them.. Just frightens them and will be afraid of you...