I understand but this is literally how rights are eroded away. It's all good when it's the worst people on the planet, but very quickly it's abused against every one else. Once these rights go away, they don't come back.
The systemic downsides of police overreach happen whether or not a particular person was guilty. In general, throwing out the evidence is an effective way to fight back against overreach. I'm not worried about this guy, I'm worried about everyone else.
The idea that they would have been able to get a warrant limits the damage, but it's still iffy.
This isn't some innocent person who is spending time in prison because of a legal technicality.