Even with high-profile, high-fear factor, violent events we're highly selective about what we freak out about. Last year a military installation shot down a co

Even with high-profile, high-fear factor, violent events we're highly selective about what we freak out about. Last year a military installation shot down a commercial airplane, killing nearly 300 people. No military solution called for, no drastic measures taken, commercial flights are still flying over war zones today. Why do we believe we should/could do something about all foreign and domestic crazy people (so called 'lone wolfs' like at Boston) and all crazy and motivated groups who hate the US because of our foreign policy in their region (and there are plenty of regions with negative perspectives) when we can't even prevent state actors from killing civilians?