To be clear, the actual proposal being made is "I am a fan of charging 2-3x the normal tax rate for H1Bs".
One interpretation is that workers should pay 2-3x the income tax, massively depressing net wages for people on visas.
Another interpretation is that employers should pay 2-3x the payroll tax (I guess Social Security and Medicare in the US?) which again means that (not immediately due to nominal wage rigidity, but over time) visa worker wages will be depressed. In any case, visa workers pay into social security, but will not be able to claim benefits unless they become green card holders.
There are already substantial fees employers have to pay, which already depress wages. The proposals suggest making it worse. There is no real thought behind them, no research, no data. Just pure naked nativism: workers must be punished even more than they are right now for daring to immigrate.
It is, in other words, extraordinarily racist. And if someone, through whatever life experiences, has come to believe that this is the way forward, then they absolutely should revisit their worldviews.
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Neither of these come anywhere close to addressing the actual problem, which is that it isn't the case that workers on visas have the same labor rights as everyone else. Workers on visas are preferentially hired by some firms because they will silently deal with abusive bosses, long work hours and sexual harassment. Giving everyone full labor rights addresses this issue completely.
Do you want H1B worker wages to be depressed, or do you not? Do you care about your fellow workers being sexually harassed, or do you not?
> I have no idea what's in the parent's heart
I don't, either, but structural racism is a million times worse than some rando shouting a slur at me.