If this was a targeted tariffs at something we specifically used to be good at, for example cars, and it came with price controls for the internal market, you might have a point.
As it stands a broad global tariff will not shift manufacturing "back" to the US it will simply serve to further monopolize the economy further.
Enabling the Capitalist tendency for monopolization is not "for nothing", it's a necessity of the system.
As those smaller businesses go out of business, their leaders will either be scooped up under the lead of larger business, or they will be forced to return to the mass labour workforce, either way their market now belongs to the higher up capitalists and their new role is ensuring profits for those bosses.