Kerbal Space Program

I'm reporting this as I think it's a bug, rather than 'as designed'.

Some buildings are incredibly easy to destroy.
Specifically, the Mission Control building (at tier 0) can be destroyed by a collision of a wing into the lamp posts outside the building at less than 2m/s, with no damage to the impactor.
Colliding a planes cockpit into the lamp posts at this speed bounces the plane off rather than blowing up the building. At 10m/s the cockpit destroys the building either by colliding with the lampposts or the building itself.

This seems to be a ridiculously low crash tolerance for the building, and indeed with other buildings the plane simply bounces off at this speed.