My theory is that Obama and Biden admins would have done it but had little incentive to do so. They have an image of being weak on crime and the Republican machine would use it against them.

Its the same reason Trump can be less of a war hawk (previous admin) because his image is one of a tough guy bully. Biden tried to talk tough but you just don't buy it.

Obama was basically Bush 2.0 but ran as being the anti-Bush. He gets into office and is constantly trying to appear to take the "war on terror" seriously. He was perceived as being less hawkish yet really wasn't.

Republicans have the problem of seeming less sensitive to the needs of the poor. Even though most admins have not cut welfare.

The political system gaurantees we get bad incentives no matter who wins.