Just about every decent-sized apartment complex or condo is an attractive "soft target," particularly at night when there will be lots of people there. Ditto most decent-sized churches during worship services, most schools during school hours (perhaps excluding those where you can't easily get your car near the classrooms), most movie theaters on a Friday evening, most high-school and middle-school sports venues during games, etc. etc.
Imagine society's outrage if instead of attacking a federal courthouse where he killed over 100 adults and just under 2 dozen little kids, McVeigh had blown up the truck outside of an large elementary school's auditorium during the Christmas play. The overall death toll might have been lower (without the "pancake collapse" of a multi-story building, a lot of injuries would be survivable) but the death toll of children would've been much, much higher, and dozens if not hundreds of victims would have serious, perhaps life-altering, physical and psychological injuries.
Imagine if the 1993 World Trade Center bombers had gone after a high-rise apartment building or hotel in New York instead of a financial center, and they set their bomb to go off at 3AM when the building was full of people, and imagine they used enough explosives to cause at least part of the building to collapse on itself like the Federal Building in Oklahoma City did. The casualties would be huge (not "9/11 huge" but huge) and the fear factor and willingness to give up personal liberties in exchange for supposed safety would be immense.
I hope that the "good guys" in our government - those charged with simultaneously protecting the public from criminals out to do us harm while taking seriously their vow to protect and defending the Constitution [yeah yeah, I know, the cynic in me acknowledges that this group may be the "empty set" - but let's assume for the moment that it's not] - are thinking a lot harder about these issues than I am and are finding ways that can deter such crimes and catch criminals when the deterrence doesn't work without taking America any further down the road to a police state than it already is.