(see also "Several Insights into muscle contraction mechanism" part 1 and 2)

Because the force generated by each half of the thick filament during twitch or during short muscle contraction is assumed to be proportional to the amount of the overlap with the thin filaments (i.e., the force generated by each half of the thick filament during muscle contraction is proportional to the number of working cross-bridges), any initial  imbalance (even the smallest one) would be amplified and  would result in an asymmetrical and ineffective contraction.

 

 

Without any doubt, such malfunctioning sarcomere will not be able to resist to the stretch exerted by neighbor normal sarcomeres in a myofibril and, therefore, will break.