[Timbergrowl]

Yes Tigerstar was ambitious and wanted to control the forest and the for clans but he never went after kits, He wasn't as bad as Brokenstar was and He only went after Halfbloods because they broke the warrior code. Those who have done so in his mind is disloyal. And since all four clans would be one that rule goes away. we'd see more and more cats fall in love and don't break the code because Tigerstar pretty much eliminated that possibility. (Except for outsiders) Firestar who was not born in a clan got in the way of his plan and that's why he was so ruthless against ThunderClan. Lots of cats can be ruthless and some cats choose not to be, Because Firestar kept surviving his traps Tigerstar became more ruthless and desperate to kill him.