make a rod for your own back idiom UK
自讨苦吃；自找麻烦；惹火烧身
If you make a rod for your own back, you act in a way that creates more problems for yourself in the future.
By giving in to the terrorists' demands, the government will simply be making a rod for its own back. 政府要是屈从于恐怖分子的要求就只会惹火烧身。