Israel and Hezbollah have been in a low-grade state of war for over a decade. If Hezbollah hadn't diverted its energy to the Syrian Civil War, they might by now have been in a state of total war. Hezbollah has units dedicated to infiltrating and attacking targets in Israeli Galilee. My guess is, and I could be wrong, that it probably doesn't make sense to attribute a motive of "dragging the US in" to Israeli strikes on Hezbollah. In many ways, Israeli strikes on Hezbollah are far more ordinary than strikes in Gaza are.