[WJW]

Trophy and similar weapons work by sending a cloud shard of metal shards in the direction of the target. Given that a presidential convoy will often be in the presence of large amounts of civilians, using active defense system may mean shredding a couple dozen voters (possibly on live television). I can't imagine many politicians being very happy about that.

I think DIY weapons would be the more dangerous threat btw. A sharpened stick on one of those racing drones could rest on top of (say) a small shack until the target comes by, then strike extremely quickly.

[newsclues]

I don’t think politicians will really care about staying alive from an attack even if a few bystanders die from the countermeasures.

[WJW]

It's not so much for when it actually happens, but publicly driving around in a car that will kill bystanders when attacked is still a no-no from a PR perspective. Just imagine how many attack ads you could create off that one thing alone.