what if we live in the US any cons?
Only cons I am aware of are the fact that Israeli citizens don't need to pay for a visa to the Russian federation, or IINM to Brazil, unlike US citizens who need to get visas which are a hassle and involve a fee (over $100 IINM) for those countries.
Also renouncing an Israeli citizenship is a royal PITA, especially if one has children. It is always better to do when single or family is small.