Social Security pays out negative returns. Meaning you're guaranteed to receive lower returns from it in contrast to whatever capital you invest. A person could do better putting their money in a bank account that pays out 0.000001% APY.

UBI is the same as social security. You're guaranteed to receive less money than whatever you invest in it. The state will likely funnel a major portion of collected tax revenues into dubious projects like giving free healthcare to illegal immigrants and funding transexual beauty pageants.

Then when the program fails as it inevitably will, they'll say the problem is taxes are too low. They'll propose tax hikes and people unfortunately being uneducated will far for it and think its a good idea, the same way many are falling for it right now.

This is the Libertarian conception of UBI. In my understanding, the general progressive conception of UBI does not advocate any corresponding reduction in the welfare state upon implementing a UBI. And UBI has many more progressive supporters than Libertarian supporters.