In these situations, I'm not entirely sure collateral damage is of a primary concern. The image of either building being damaged or destroyed or the threat to elected representatives likely presents a worse impact than collateral damage might. Its like all the special protections they already have. For instance, punch your neighbor and face a misdemeanor, punch a senator or the president and it is not only a felony but a serious one at that. Kill someone in an auto accident and it can be a charge with less than 10 years but run over a police dog and you face life for killing an officer of the law.
Our system has said they are special and more protected than most people for quite a while now.