in Germany alone there were several protest going on due to the problem they see from high tax, energy cost, unemployment and inflation.
In France, there are already anti NATO protest. The people are protesting to exit NATO and demanding to stop supplying arms to Ukraine.
Did NATO member states underestimated the consequences of the support of Ukraine and sanctions on Russia?
The answer might be yes or no. Yes because is glaring that most European nations cannot manage the economic downturn caused by their decision to punish Russia. It is glaring that there is no plan on how to substitute the Russian gas supply and this has caused high power costs and unemployment. Also, the cost of arming Ukraine was also underestimated because currently, some NATO countries might not be able to afford to spend on Ukraine while they are borrowing to sustain their economies.
The answer could also be that NATO nations a willing to go through any kind of pain to enable them to curtail the excesses of Russia. They are willing to pay any price to correct the mistake they made when they over-depended on Russian oil and gas. Hence, these governments are willing to endure the consequences of boycotting Russian supplies as they learn or devise ways of getting alternative suppliers. These NATO members believe that stopping Russia from its constant annexation of territories by arming Ukraine is a risk worth taking. But it seems this option is harming the populace and the suffering overshadowing the intentions of the government.