Here’s the thing - the president and his immediate family get secret service protection for life.
Even if they are thrown in jail.
Now imagine, say Donald Jr. in jail.
You have all these rival gangs - each one wanting to get the most respect for killing him.
So you have 20 secret service agents in jail with him having to fight off all of these weird gangs. Imagine how ridiculous it would get.
That’s why even if they are arrested house arrest is the most realistic thing you can expect out of it.
The Secret Service really isn’t in the business of settling intra-prison rivalries out.