Yeah. If they caused something to break or fail that is not part of a normal checklist (and I'm not sure what this would be - maybe an over-tightened seat post collar that failed and caused your seat to slide down ) then they are to blame. Just so you know, most pros have their brakes loose enough that they can get the tire out without flipping that lever and the brifters will almost hit the bar if you squeeze them hard. Easier to modulate and control when your fingers are more curled.