I agree with your Mother-in-Law a”h 100%.
Not only did she have common sense, meaning, that when the economy is bad, as it is today, and people are hurting financially, then they pass a street in Brooklyn, NY, and see three luxury cars, BMWs, etc. lined up, and they are all in front of the biggest and fanciest house of the entire neighborhood, and these people have Anti-Semitic feelings at the best of times, this might have been the trigger to torch those cars as it happened last Friday.
But why rely on our own reasoning when our patriarch Yaakov Ovinu, begged his children not show off in front of the Gentiles when there was starvation all around them:
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