I disagree, I do not think it is a exaggeration.
yes, we have good guards. but not only does the offence always have the advantage when it comes to battles since they can pick when/where to start the battle (having a pre-cog like rids on our side is huge because it actually turns this advantage around on the opponent) but we are dealing with people/forces that either: have access to nigh-undetectable and super-deep agents (the alpha agents), or have access to the majority of our planets/places as they are not (yet) openly our enemys (the conservatives). (oh, and its not like tezeetch doesn't have a big enough grudge against us to give a blessing to whoever takes a swing at us))
what could ANY guard-unit do to protect somebody or a shipyard reactor against a well-placed, well-timed bomb? or several? or dozens even coordinated to catch us off guard ? possibly laced with who-knows-what? it would take alot of skill sure, but the reason I'm so concerned is that every source we have says that alpha-agents have that in spades and they might get the idea to work with the conservative extremists. (and the statistics we got a few days on the support the conservatives have suggest that there are still too many of them for us to spy on every individual 24/7)
we might have good guards, but the fact is they have to be checking basically every square foot of every building/location on every planet/station that has any worth at all nearly 24/7, because we can't choose when or where the enemy attacks. I just do not see how this is realistically possible even for our solders without spending more resources then we can afford (especially in the middle of a war too)
theres a reason why terrorism/spy-work/subterfuge is so effective --- there is basically nothing you can do if its done right (and we know our enemies are capable of doing it not just well, but near-perfectly) and its also why most governments in RL are spending so much money on various intelligence-gathering/countering techs....because they are desperate to find ways to protect high-value targets cheaply.
First off, the conservatives are by and large not part of this shadow war on the enemy's side. They hate Chaos too, so will be acting against the Chaos agents unless they happen to be corrupted. Don't confuse who we're fighting against here. This is mostly a matter of outside infiltrators.
Now, our top people are under heavy guard, and the closer an infiltrator gets to them the higher the chances of detection - anyone expected to deal with people of priority are going to be checked thoroughly. Given that tech theft is going to be the primary goal of most infiltrators we're dealing with, it's better for them to not try to get close since it would put them under much heavier scrutiny. I'm not terribly worried about assassinations, and if it was expected to be a huge problem I'd expect that we'd have gotten a warning in an update about it.
For blowing up a shipyard reactor, that might at best destroy a small part of a shipyard. You need to realize that our shipyards are huge, and they've got lots and lots of reactors. What's more, the reactors would be one of the most secured, checked on, and maintained sections of a shipyard. Such terrorism is also going to get a lot of focus put on groups that try it, and end up with them being more likely to be exposed.
The primary goals of the Chaos side of the shadow war are going to be to put people in positions where they can steal technology and gain knowledge of our plans. Overt terrorism is not likely to be a huge part of it. And again, the Inquisition isn't asking for huge amounts of help. I'm fine with helping anyways, but I think the problems aren't nearly as dire as you're making them out to be.
@Enjou What do you think of the idea of switching the last diplomacy action to sending all of the data Maximal has on Psyker/warp genetics to Secondus so that Cawl can get his hands on it? As has been mentioned before Cawl gaining our advanced warp/psyker genetic knowledge which has been noted to be way ahead of all the other human polities due to living on Avernus and studying the wildlife. Seeing as the Astartes are largely build around that it seems like it could seriously speed up his research which would be great for everyone since they can share.
That and Cawl may be interested enough to consider learning from Maximal himself or outright moving to Avernus if he believes he can benefit from the research here.
I suppose we can do that.
It might be a good idea to ask if any of the lizardmen want to fight on Hvergelmir as well. After all, the weapon enchanting thing the saurus do does depend on Veterancy.
I don't like the idea of taking any Avernite animals or peoples to fight the psychic bugs that absorb DNA and copy powers.