This is just cope. NATO membership wouldn't make a difference since even though Ukraine was not a de jure member, it received arms, ammunition, training, intelligence support, supplies and even soldiers from NATO countries. Ukraine is a de facto NATO member. NATO didn't commit fully to Ukraine because the West views the country as a puppet, not as a strategic member.

People sometimes are so invested in liberal ideology, that they think laws give some kind of magical protection to them. But laws and agreements are broken all the time. A country under NATO could be invaded by Russia or any other power and I wouldn't be surprised if the alliance failed to come to this country's aid.

NATO exists to serve primarily US interests and after that, the most powerful members of Western Europe which possess nuclear weapons. All the rest are just cannon fodder, or as financiers of US military industrial complex.