yes, because throughout history this has been abused. This was the reason that Caesar crossed the Rubicon - his opponents were all queued up to sue him into oblivious on his term as counsel ended.

Why are we okay asking soldiers to die, but asking the President to risk prosecution and be subject to the law is "too much"?

Because we need governments and can't afford to make it so that anyone who ever wins elections spends the rest of their life fighting off lawsuits. Wars happen, and governments exist, people forget that laws are used as much to impede good governance as they are to enforce good governance.

What would be the consequences if we did allow Presidents to be prosecuted and some of them did spend the rest of the life fighting prosecutions?

It seems to me the consequence would be that we would have Presidents who act carefully to not break the law. Are there any other consequences?

I've heard it said that "democracies are where the people in power lose". We've all seen "democracies" where the party in power never loses; those aren't real democracies. Likewise, I would say nations that are truly governed by law are where those in power face legal prosecution.

(Also, what's so bad about prosecution? If a person is innocent, the legal system will find them to be innocent, right?... Right?)

The consequences would be Lawfare.

And what's the consequence of that? Presidents who are extra careful to obey the law because they know they will be highly scrutinized?

Or, to put it another way:

There are good and competent people who say "I'm willing to be President and be subject to the law, I'm willing to do both". Why can't be pick a President from that group?

Because doing so gives the President tons of incentives for bad behavior. It's a fun case where "risk of prosecution" would result in tons more questionable behavior then less.

Not less than the average sacrifice a soldier made. The average soldier would not sign up if they had a significant chance of going to prison afterwards.

Yes it's too much to ask every president to significantly risk jail time for being president.

Great rhetorical question, but do consider these points: 1. we ask everyone to do their individual jobs. In a soldier's case, loss of life is a job hazard. In the President's case, making tough decisions that could kill soldiers and civilians is a job hazard 2. The assassination rate for US Presidents is 8.7% (4/46 Presidents were assassinated). 3. There were 1,922 US combat deaths in Afghanistan (ref 1) and at the peak of the war, there were 100,000 troops there (ref 2). If you ignore all the other years of deployment, a US soldier's death risk in Afghanistan was 1.9%

Numbers are hard when they go against our intuition, but every US President is taking a comparable risk to being a soldier according to these numbers.

Obama took the risk of being a President while Black Trump took the risk of being a President while Orange

Ref 1. https://en.wikipedia.org/wiki/Coalition_casualties_in_Afghan... 2. https://www.militarytimes.com/news/your-military/2016/07/06/...