Is the recent increase in terrorist attacks in Germany another sign that military involvement in foreign countries may be to blame?

Back in December of 2015, Germany signed onto an expanded military role with the US in Syria. Since then, terror attacks have risen drastically in Germany.
Our failure to consider the fact that occupying and bombing up to 7 muslim countries over the past 15–20 years leads to more terrorism and violence, may be a fatal flaw that makes us less safe. What if it is not the religion itself that causes these actions, but the results of our actions in several countries who share this religion? According to defense.gov, the US and coalition forces have conducted 13,803 airstrikes in Syria and Iraq. These recent terrorists in Germany were in there late teens or early 20’s. What do we expect of someone in this age range when they have been exposed to almost 14 thousand airstrikes during their life?