If Mr. Widget isn't competitive at $100 vs. imports sold at $90, and you add a tariff of $10 so its "competitive", suddenly Mr. Widget's sales will increase. The other country, knowing their widgets aren't competitive (except $$ wise) then tariffs something like solar panels to protect a nascent solar panels industry.
Tariffs are a form of welfare for domestic corporations. Creating a new Mr. Widget on the assumption that tariffs will remain the same is an expensive gamble you take only if you are sure your widgets are better than Mr. Widget's widgets.
Subsidized loans (i.e. "The Bank of Boeing") are another example of welfare for domestic corporations.
The administration has also set aside $12 billion to relieve farmers hurt by the tariffs. [1] This money could come from the money generated by the tariffs, making it look more like a handout.
[1] https://www.npr.org/2018/07/24/631953880/trump-administratio...
Firms are going to be clever and will find ways to have laws passed that give them advantages over other firms.
This is one reason Zuck said he thinks Facebook should be regulated. As the biggest player in the space, Facebook can afford to hire the lawyers and additional staff necessary to comply with such regulation. Smaller firms on the other hand will be less able to afford this and so the regulation serves as a barrier to competition that insulates Facebook from competition.
Government crony deals come in all different shapes and sizes. In the early 2000s the government gave a big handout to oil companies by changing the accounting rules, allowing the firms to sell lots of oil at a massive profit without having to claim the profit, since they could suddenly consider the "cost" of the oil based on LIFO rather than FIFO. This small change gifted the industry with billions of dollars that would otherwise have been paid in corporate tax.
You might think that all these crony deals are a good thing and are just capitalism in action. Quite the contrary. Firms should be innovating better products and services, not figuring out ways to come up with sweet deals with regulators that give them advantages and steal from society or unfairly harm smaller, non-incumbent firms.
And to be sure, whenever those policies can be framed as being essential to national security, they will be, as this helps make the crony capitalism harder for the average person to spot and lets the jingoistic ideal of "helping our firms vs foreign firms" be the focal point.
You weaken your (otherwise solid) argument when you do that. Tariffs and welfare are two different things, and you know that, and everybody reading this knows that, but you try to sneak in a conflation anyway. They're both bad, but they're bad for different reasons: accepting that taxation is a necessary evil (I'm not sure I do, but set that aside), welfare involves paying out of tax revenues into individuals pockets. Tariffs are exactly the opposite - tariffs involve increasing tax revenue by collecting taxes on imports, and then using that tax revenue for whatever you use all the other tax revenue for. Trying to imply that they're the same just looks like you're trying to score cheap points with people who have poor critical thinking skills.